bit-babbler 0.5 / usr / share / munin / plugins / bit_babbler

#!/usr/bin/perl -w

# This file is distributed as part of the bit-babbler package.
# Copyright 2014 - 2015,  Ron <ron@debian.org>

# Munin magic markers
#%# family=auto
#%# capabilities=autoconf

use strict;

use IO::Socket;
use JSON::XS;
use Munin::Plugin;

my $control_socket = $ENV{'control_socket'} || "/var/run/bit-babbler/seedd.socket";
my $json;


sub cmd_request($)
{ #{{{

    my $request = shift;

    my $sock = IO::Socket::UNIX->new(
        Type => SOCK_STREAM,
        Peer => $control_socket
    ) or die "Could not create socket: $!\n";

    my $max_chunk_size = 65536;
    my $data;
    my $msg;
    my $flags;

    $sock->send('"' . $request . "\"\0") or die "Failed to send '$request' request: $!\n";
    do {
        $sock->recv($data,$max_chunk_size,$flags) or die "Failed to read reply: $!\n";
        $msg .= $data;
    }
    while( $data !~ /\0/ );

    $json = eval { JSON::XS->new->decode($msg) };
    die "JSON decode failed: $@: $msg\n" if $@;

    if ($json->[0] ne $request) {
        die "Unrecognised reply: $json->[0]\n";
    }

} #}}}

sub get_ids()
{
    cmd_request("GetIDs");
}

sub get_stats()
{
    cmd_request("ReportStats");
}

sub unique_list(@) {
    my %h;
    map { $h{$_}++ ? () : $_ } @_;
}


sub report_bitrate_config(@)
{ #{{{

    print "multigraph bb_bitrate\n";
    print "graph_title BitBabbler bytes output\n";
    print "graph_vlabel Bytes/second\n";
    print "graph_category system\n";

    for (@_) {
        my $f = clean_fieldname($_);

        print "${f}_qa_passed.label $_\n";
        print "${f}_qa_passed.type COUNTER\n";
        print "${f}_qa_passed.max 1000000\n";
        print "${f}_qa_passed.info Good entropy output\n";
    }


    for (@_) {
        my $f = clean_fieldname($_);

        print "multigraph bb_bitrate.output_$f\n";
        print "graph_title BitBabbler $_ bytes output\n";
        print "graph_vlabel Bytes/second\n";
        print "graph_category system\n";
        print "graph_info This graph shows the demand for entropy (and the rate at "
            . "which it is able to be delivered). The discarded rate is entropy which "
            . "was read from the device, but which was not used because either the "
            . "QA checks are currently failing, or they are still confirming whether "
            . "a failure was really a transient anomaly or not.  It is not unusual to "
            . "have some entropy discarded at first start up, since the QA checking "
            . "puts the initial onus on the source to prove it is good, and will not "
            . "pass entropy from it until it does.  The passed rate includes entropy "
            . "that is output even when none is being consumed, which is used to keep "
            . "the pools constantly fresh.\n";

        print "${f}_qa_passed.label Passed\n";
        print "${f}_qa_passed.type COUNTER\n";
        print "${f}_qa_passed.max 1000000\n";
        print "${f}_qa_passed.info Good entropy output\n";

        print "${f}_qa_unpassed.label Discarded\n";
        print "${f}_qa_unpassed.type COUNTER\n";
        print "${f}_qa_unpassed.max 1000000\n";
        print "${f}_qa_unpassed.warning 1\n";
        print "${f}_qa_unpassed.info Discarded entropy\n";
    }

} #}}}

sub report_bitrate_values(@)
{ #{{{

    print "multigraph bb_bitrate\n";
    for (@_) {
        my $f  = clean_fieldname($_);
        my $qa = $json->[2]{$_}{'QA'} if exists $json->[2]{$_};

        print "${f}_qa_passed.value " . ($qa ? $qa->{'BytesPassed'} : "U") . "\n";
    }

    for (@_) {
        my $f  = clean_fieldname($_);
        my $qa = $json->[2]{$_}{'QA'} if exists $json->[2]{$_};

        print "multigraph bb_bitrate.output_$f\n";

        if (defined $qa) {
            print "${f}_qa_passed.value $qa->{'BytesPassed'}\n";
            print "${f}_qa_unpassed.value " . ($qa->{'BytesAnalysed'} - $qa->{'BytesPassed'}) . "\n";
        } else {
            print "${f}_qa_passed.value U\n";
            print "${f}_qa_unpassed.value U\n";
        }
    }

} #}}}


sub report_ent_config(@)
{ #{{{

    # Check if the Ent test long statistics are expected to have converged on
    # their threshold limits.  We don't want to bark warnings here until then.
    #
    # This is a bit ugly, it means we fetch the stats used to output the values
    # during both the config and the fetch phases.  We could cache them during
    # fetch, but that's backward and the first config run will potentially read
    # stale data from the cache (triggering a burst of false warnings, which is
    # exactly what this extra complication is here to solve ...).  We could
    # instead cache them here, and read that during fetch -- but it's not clear
    # that's actually simpler or in any way more efficient than just querying
    # for them twice ...  We could also add a simpler request to the protocol,
    # that only fetches the sample counts we need to inspect here, but that may
    # be overengineering our way around this too.
    #
    # What we do here then, is check if Ent::Limits::long_minsamples has been
    # reached yet for each device we are graphing, and flag each of them that
    # have.  We then use that to decide whether to include the warning limits
    # in the config for each graph.  This avoids the situation where devices
    # that aren't having a lot of data read from them, and which may take many
    # hours, or even days, to reach the long test convergence thresholds, will
    # be reporting 'false' warnings each time the process is restarted until
    # that finally happens.  With this, the warnings will only trigger in the
    # cases where the test is considered to have actually failed and the output
    # from the device is being suppressed.  Which is the only case we really
    # want to alert the admin about.  Crying wolf when the test is not actually
    # valid yet will just lead someone to ignore a real failure - and relaxing
    # the thresholds for warnings here to avoid that would mean a real failure
    # might go unnoticed for a longer period than would be ideal, or be harder
    # to pinpoint the real cause when some other metric alerts them to it.
    #
    # So it's better to be a little bit ugly here, than a lot ugly for users.
    # This could be a lot easier if munin didn't split each request into two
    # separate phases that both occur for every poll.
    my %warn;

    get_stats();

    for (keys %{$json->[2]}) {
        my $f       = clean_fieldname($_);
        my $ent8    = $json->[2]{$_}{'Ent8'};
        my $ent16   = $json->[2]{$_}{'Ent16'};

        $warn{$f}{'Ent8'} = 1
            if (defined $ent8 && $ent8->{'Long'}{'Samples'} > 250000000);

        $warn{$f}{'Ent16'} = 1
            if (defined $ent16 && $ent16->{'Long'}{'Samples'} > 500000000);
    }



    print "multigraph bb_ent\n";
    print "graph_title BitBabbler Ent tests\n";
    print "graph_args --alt-autoscale --alt-y-grid\n";
    print "graph_vlabel Shannon entropy (per 8 bits)\n";
    print "graph_scale no\n";
    print "graph_printf %9.6lf\n";
    print "graph_category system\n";

    for (@_) {
        my $f = clean_fieldname($_);

        print "${f}_ent_entropy_short.label $_ short term\n";
        print "${f}_ent_entropy_short.info Short term entropy estimate\n";

        print "${f}_ent_entropy_long.label $_ long term\n";
        print "${f}_ent_entropy_long.info Long term entropy estimate\n";
    }


    for (@_) {
        my $f = clean_fieldname($_);

        print "multigraph bb_ent.chisq16_$f\n";
        print "graph_title BitBabbler $_ Chi^2 distribution (16-bit)\n";
        print "graph_args --alt-autoscale"
            . " 'HRULE:66659.52#ffaaaa:Random will exceed 66659.52 less than 0.1% of the time'"
            . " 'COMMENT: \\j'"
            . " 'HRULE:64421.97#ffaaaa:Random will exceed 64421.97 more than 99.9% of the time'"
            . " 'COMMENT: \\j'"
            . "\n";
        print "graph_vlabel Chi^2\n";
        print "graph_scale no\n";
        print "graph_printf %8.2lf\n";
        print "graph_category system\n";
        print "graph_info This graph shows the results of Pearson's Chi-squared test "
            . "for short and long sequences of 16-bit samples.  The short term result is "
            . "a test of the 100 million most recently generated samples.  The long term "
            . "result is computed over all samples generated since the process being "
            . "queried began.<br><br>"
            . "A statistically random sequence would be expected to exceed 64421.97 99.9% "
            . "of the time, 64695.73 99% of the time, and 64940.64 95% of the time."
            . "  A Chi-squared statistic smaller than this indicates the sample values "
            . "were more uniformly distributed than would normally be expected from a "
            . "random selection.<br><br>"
            . "At the opposite end of expectation, it is likely to exceed 66131.63 only "
            . "5% of the time, 66380.17 1% of the time, and 66659.52 just 0.1% of the time."
            . "  A Chi-squared statistic larger than this indicates the sample values "
            . "were less uniformly distributed than would normally be expected from a "
            . "random selection.<br><br>"
            . "A sustained rate of results outside of these bounds for the short term "
            . "test would indicate a systemic failure.  Since the long term test is "
            . "continually accumulating upon the same set of data, it may be expected "
            . "to take fairly long duration excursions out to the extreme limits of "
            . "probability before eventually returning to a more expected range.\n";

        # Roughly 1 in 100 million chance of passing the warning thresholds
        # Roughly buckley's of passing the critical thresholds in normal operation
        print "${f}_ent16_chisq_short.label Short term\n";
        print "${f}_ent16_chisq_short.line "
            . "64940.644:cccccc:Random will exceed 64940 more than 95% of the time\n";
        print "${f}_ent16_chisq_short.warning 321:67459\n";
        print "${f}_ent16_chisq_short.critical 35:70000\n";
        print "${f}_ent16_chisq_short.info Short term Chi^2 distribution\n";

        print "${f}_ent16_chisq_long.label Long term\n";
        print "${f}_ent16_chisq_long.line "
            . "66131.632:cccccc:Random will exceed 66131 less than 5% of the time\n";
        print "${f}_ent16_chisq_long.warning 63823:67265\n";
        print "${f}_ent16_chisq_long.critical 35:70000\n";
        print "${f}_ent16_chisq_long.info Long term Chi^2 distribution\n";
    }

    for (@_) {
        my $f = clean_fieldname($_);

        print "multigraph bb_ent.chisq_$f\n";
        print "graph_title BitBabbler $_ Chi^2 distribution (8-bit)\n";
        print "graph_args --alt-autoscale"
            . " 'HRULE:330.523#ffaaaa:Random will exceed 330.523 less than 0.1% of the time'"
            . " 'COMMENT: \\j'"
            . " 'HRULE:190.869#ffaaaa:Random will exceed 190.869 more than 99.9% of the time'"
            . " 'COMMENT: \\j'"
            . "\n";
        print "graph_vlabel Chi^2\n";
        print "graph_scale no\n";
        print "graph_printf %8.2lf\n";
        print "graph_category system\n";
        print "graph_info This graph shows the results of Pearson's Chi-squared test "
            . "for short and long sequences of 8-bit samples.  The short term result is "
            . "a test of the 500,000 most recently generated samples.  The long term "
            . "result is computed over all samples generated since the process being "
            . "queried began.<br><br>"
            . "A statistically random sequence would be expected to exceed 190.869 99.9% "
            . "of the time, 205.421 99% of the time, and 219.025 95% of the time."
            . "  A Chi-squared statistic smaller than this indicates the sample values "
            . "were more uniformly distributed than would normally be expected from a "
            . "random selection.<br><br>"
            . "At the opposite end of expectation, it is likely to exceed 293.248 only "
            . "5% of the time, 310.457 1% of the time, and 330.523 just 0.1% of the time."
            . "  A Chi-squared statistic larger than this indicates the sample values "
            . "were less uniformly distributed than would normally be expected from a "
            . "random selection.<br><br>"
            . "A sustained rate of results outside of these bounds for the short term "
            . "test would indicate a systemic failure.  Since the long term test is "
            . "continually accumulating upon the same set of data, it may be expected "
            . "to take fairly long duration excursions out to the extreme limits of "
            . "probability before eventually returning to a more expected range.\n";

        # Roughly 1 in 100 million chance of passing the warning thresholds
        # Roughly buckley's of passing the critical thresholds in normal operation
        print "${f}_ent_chisq_short.label Short term\n";
        print "${f}_ent_chisq_short.line "
            . "219.025:cccccc:Random will exceed 219.025 more than 95% of the time\n";
        print "${f}_ent_chisq_short.warning 147:400\n";
        print "${f}_ent_chisq_short.critical 32:500\n";
        print "${f}_ent_chisq_short.info Short term Chi^2 distribution\n";

        print "${f}_ent_chisq_long.label Long term\n";
        print "${f}_ent_chisq_long.line "
            . "293.248:cccccc:Random will exceed 293.248 less than 5% of the time\n";
        print "${f}_ent_chisq_long.warning 161:377\n";
        print "${f}_ent_chisq_long.critical 32:500\n";
        print "${f}_ent_chisq_long.info Long term Chi^2 distribution\n";
    }


    for (@_) {
        my $f = clean_fieldname($_);

        print "multigraph bb_ent.entropy16_$f\n";
        print "graph_title BitBabbler $_ estimated entropy (16-bit)\n";
        print "graph_args --alt-autoscale --alt-y-grid\n";
        print "graph_vlabel Entropy (per 16 bits)\n";
        print "graph_scale no\n";
        print "graph_printf %9.6lf\n";
        print "graph_category system\n";
        print "graph_info This graph shows the calculated Shannon and min entropy "
            . "for a short term sequence of the most recent 100 million samples, and "
            . "over the long term of all samples generated since the process being "
            . "queried began.  The Shannon entropy is based on the number of times "
            . "that each possible sequence of 16 bits occurred.  The min-entropy is "
            . "a more conservative estimate that is based only on the number of "
            . "times that the most frequent sample value was seen.\n";

        print "${f}_ent16_entropy_short.label Shannon entropy short term\n";
        print "${f}_ent16_entropy_short.warning 15.9995:\n";
        print "${f}_ent16_entropy_short.critical 15.8:\n";
        print "${f}_ent16_entropy_short.info Short term Shannon entropy estimate\n";

        print "${f}_ent16_entropy_long.label Shannon entropy long term\n";
        if (defined $warn{$f}{'Ent16'}) {
            print "${f}_ent16_entropy_long.warning 15.9999:\n";
            print "${f}_ent16_entropy_long.critical 15.99:\n";
        }
        print "${f}_ent16_entropy_long.info Long term Shannon entropy estimate\n";

        print "${f}_ent16_minentropy_short.label Min-entropy short term\n";
        print "${f}_ent16_minentropy_short.warning 15.708:\n";
        print "${f}_ent16_minentropy_short.critical 15.7:\n";
        print "${f}_ent16_minentropy_short.info Short term min-entropy estimate\n";

        print "${f}_ent16_minentropy_long.label Min-entropy long term\n";
        if (defined $warn{$f}{'Ent16'}) {
            print "${f}_ent16_minentropy_long.warning 15.893:\n";
            print "${f}_ent16_minentropy_long.critical 15.8:\n";
        }
        print "${f}_ent16_minentropy_long.info Long term min-entropy estimate\n";
    }

    for (@_) {
        my $f = clean_fieldname($_);

        print "multigraph bb_ent.entropy_$f\n";
        print "graph_title BitBabbler $_ estimated entropy (8-bit)\n";
        print "graph_args --alt-autoscale --alt-y-grid\n";
        print "graph_vlabel Entropy (per 8 bits)\n";
        print "graph_scale no\n";
        print "graph_printf %9.6lf\n";
        print "graph_category system\n";
        print "graph_info This graph shows the calculated Shannon and min entropy "
            . "for a short term sequence of the most recent 500,000 samples, and "
            . "over the long term of all samples generated since the process being "
            . "queried began.  The Shannon entropy is based on the number of times "
            . "that each possible sequence of 8 bits occurred.  The min-entropy is "
            . "a more conservative estimate that is based only on the number of "
            . "times that the most frequent sample value was seen.\n";

        print "${f}_ent_entropy_short.label Shannon entropy short term\n";
        print "${f}_ent_entropy_short.warning 7.999:\n";
        print "${f}_ent_entropy_short.critical 7.8:\n";
        print "${f}_ent_entropy_short.info Short term Shannon entropy estimate\n";

        print "${f}_ent_entropy_long.label Shannon entropy long term\n";
        if (defined $warn{$f}{'Ent8'}) {
            print "${f}_ent_entropy_long.warning 7.999999:\n";
            print "${f}_ent_entropy_long.critical 7.999:\n";
        }
        print "${f}_ent_entropy_long.info Long term Shannon entropy estimate\n";

        print "${f}_ent_minentropy_short.label Min-entropy short term\n";
        print "${f}_ent_minentropy_short.warning 7.73:\n";
        print "${f}_ent_minentropy_short.critical 7.7:\n";
        print "${f}_ent_minentropy_short.info Short term min-entropy estimate\n";

        print "${f}_ent_minentropy_long.label Min-entropy long term\n";
        if (defined $warn{$f}{'Ent8'}) {
            print "${f}_ent_minentropy_long.warning 7.99:\n";
            print "${f}_ent_minentropy_long.critical 7.9:\n";
        }
        print "${f}_ent_minentropy_long.info Long term min-entropy estimate\n";
    }


    for (@_) {
        my $f = clean_fieldname($_);

        print "multigraph bb_ent.mean16_$f\n";
        print "graph_title BitBabbler $_ mean value (16-bit)\n";
        if (defined $warn{$f}{'Ent16'}) {
            print "graph_args --alt-autoscale --alt-y-grid\n";
        } else {
            print "graph_args --alt-autoscale --alt-y-grid"
                . " HRULE:32765.63#bbbbff"
                . " HRULE:32769.37#bbbbff"
                . "\n";
        }
        print "graph_vlabel Mean of all samples\n";
        print "graph_scale no\n";
        print "graph_printf %10.6lf\n";
        print "graph_category system\n";
        print "graph_info This graph shows a simple arithmetic mean of 16-bit samples "
            . "over short and long term sequences.  The short term result is a test "
            . "of the 100 million most recently generated samples.  The long term result "
            . "is calculated over all samples generated since the process being queried "
            . "began.  An unbiased sequence would be expected to converge on 32767.5 over "
            . "the long term, but the 16-bit mean can require a large number of samples "
            . "before it does.\n";

        print "${f}_ent16_mean_short.label Short term\n";
        print "${f}_ent16_mean_short.line 32767.5:bbbbbb\n";
        print "${f}_ent16_mean_short.warning 32759.81:32775.19\n";
        print "${f}_ent16_mean_short.critical 32757.5:32777.5\n";
        print "${f}_ent16_mean_short.info Short term mean\n";

        print "${f}_ent16_mean_long.label Long term\n";
        if (defined $warn{$f}{'Ent16'}) {
            print "${f}_ent16_mean_long.warning 32765.63:32769.37\n";
            print "${f}_ent16_mean_long.critical 32762.5:32772.5\n";
        }
        print "${f}_ent16_mean_long.info Long term mean\n";
    }

    for (@_) {
        my $f = clean_fieldname($_);

        print "multigraph bb_ent.mean_$f\n";
        print "graph_title BitBabbler $_ mean value (8-bit)\n";
        if (defined $warn{$f}{'Ent8'}) {
            print "graph_args --alt-autoscale --alt-y-grid\n";
        } else {
            print "graph_args --alt-autoscale --alt-y-grid"
                . " HRULE:127.481#bbbbff"
                . " HRULE:127.519#bbbbff"
                . "\n";
        }
        print "graph_vlabel Mean of all samples\n";
        print "graph_scale no\n";
        print "graph_printf %10.6lf\n";
        print "graph_category system\n";
        print "graph_info This graph shows a simple arithmetic mean of 8-bit samples "
            . "over short and long term sequences.  The short term result is a test "
            . "of the 500,000 most recently generated samples.  The long term result "
            . "is calculated over all samples generated since the process being queried "
            . "began.  An unbiased sequence would be expected to converge on 127.5 over "
            . "the long term.\n";

        print "${f}_ent_mean_short.label Short term\n";
        print "${f}_ent_mean_short.warning 126.92:128.08\n";
        print "${f}_ent_mean_short.critical 126.5:128.5\n";
        print "${f}_ent_mean_short.info Short term mean\n";

        print "${f}_ent_mean_long.label Long term\n";
        if (defined $warn{$f}{'Ent8'}) {
            print "${f}_ent_mean_long.warning 127.481:127.519\n";
            print "${f}_ent_mean_long.critical 127.0:128.0\n";
        }
        print "${f}_ent_mean_long.info Long term mean\n";
    }


    for (@_) {
        my $f = clean_fieldname($_);

        print "multigraph bb_ent.pi_error_$f\n";
        print "graph_title BitBabbler $_ Monte Carlo test (24-bit)\n";
        if (defined $warn{$f}{'Ent8'}) {
            print "graph_args --base 1000\n";   # Don't inherit parent args
        } else {
            print "graph_args --base 1000 HRULE:-0.03#bbbbff HRULE:0.03#bbbbff\n";
        }
        print "graph_vlabel % error calculating Pi\n";
        print "graph_scale no\n";
        print "graph_printf %6.4lf\n";
        print "graph_category system\n";
        print "graph_info This graph shows the error in computing the value of "
            . "Pi using the 'Monte Carlo Method'.  Consecutive sequences of "
            . "24 bits are taken as X and Y coordinates inside a square.  "
            . "Since a circle inscribed in that square occupies Pi/4 of its "
            . "area, then a uniformly distributed set of random points should "
            . "fall inside or outside the radius of the circle with a ratio "
            . "that when multiplied by 4 gives an approximation for Pi.  The "
            . "short term result is a test of the most recent 500,000 samples. "
            . "The long term result is computed over all samples generated since "
            . "the process being queried began.  The results are graphed as the "
            . "percentage of error relative to the real value of Pi.  This test "
            . "is relatively slow to converge on an accurate estimation, but a "
            . "sustained or persistently diverging inaccuracy in the estimation "
            . "would indicate a systemic error in the uniformity of the sample "
            . "values.\n";

        print "${f}_ent_pi_error_short.label Short term\n";
        print "${f}_ent_pi_error_short.warning -0.97:0.97\n";
        print "${f}_ent_pi_error_short.critical -2.0:2.0\n";
        print "${f}_ent_pi_error_short.info Short term error percentage\n";

        print "${f}_ent_pi_error_long.label Long term\n";
        if (defined $warn{$f}{'Ent8'}) {
            print "${f}_ent_pi_error_long.warning -0.03:0.03\n";
            print "${f}_ent_pi_error_long.critical -1.0:1.0\n";
        }
        print "${f}_ent_pi_error_long.info Long term error percentage\n";
    }


    for (@_) {
        my $f = clean_fieldname($_);

        print "multigraph bb_ent.autocorr16_$f\n";
        print "graph_title BitBabbler $_ serial correlation (16-bit)\n";
        if (defined $warn{$f}{'Ent16'}) {
            print "graph_args --base 1000\n";   # Don't inherit parent args
        } else {
            print "graph_args --base 1000 HRULE:-0.00008#bbbbff HRULE:0.00008#bbbbff\n";
        }
        print "graph_vlabel Serial correlation coefficient\n";
        print "graph_scale yes\n";
        print "graph_printf %7.3lf\n";
        print "graph_category system\n";
        print "graph_info This graph shows the autocorrelation coefficient for "
            . "a lag of 1 over the sequence of samples.  This gives a measure "
            . "of the extent to which each sample is related to the previous one. "
            . "A perfectly predictable stream will converge on a result of 1.0, "
            . "and a perfectly unpredictable one will converge on a result of 0."
            . "The short term result is a test of the 100 million most recently "
            . "generated samples.  The long term result is computed over all "
            . "samples generated since the process being queried began.  "
            . "A sustained divergence away from 0 or values close to +/- 1 "
            . "indicate a problem that ought to be investigated.\n";

        print "${f}_ent16_autocorr_short.label Short term\n";
        print "${f}_ent16_autocorr_short.warning -0.00044:0.00044\n";
        print "${f}_ent16_autocorr_short.critical -0.005:0.005\n";
        print "${f}_ent16_autocorr_short.info Short term serial correlation\n";

        print "${f}_ent16_autocorr_long.label Long term\n";
        if (defined $warn{$f}{'Ent16'}) {
            print "${f}_ent16_autocorr_long.warning -0.00011:0.00011\n";
            print "${f}_ent16_autocorr_long.critical -0.001:0.001\n";
        }
        print "${f}_ent16_autocorr_long.info Long term serial correlation\n";
    }

    for (@_) {
        my $f = clean_fieldname($_);

        print "multigraph bb_ent.autocorr_$f\n";
        print "graph_title BitBabbler $_ serial correlation (8-bit)\n";
        if (defined $warn{$f}{'Ent8'}) {
            print "graph_args --base 1000\n";   # Don't inherit parent args
        } else {
            print "graph_args --base 1000 HRULE:-0.0002#bbbbff HRULE:0.0002#bbbbff\n";
        }
        print "graph_vlabel Serial correlation coefficient\n";
        print "graph_scale yes\n";
        print "graph_printf %7.3lf\n";
        print "graph_category system\n";
        print "graph_info This graph shows the autocorrelation coefficient for "
            . "a lag of 1 over the sequence of samples.  This gives a measure "
            . "of the extent to which each sample is related to the previous one. "
            . "A perfectly predictable stream will converge on a result of 1.0, "
            . "and a perfectly unpredictable one will converge on a result of 0."
            . "The short term result is a test of the 500,000 most recently "
            . "generated samples.  The long term result is computed over all "
            . "samples generated since the process being queried began.  "
            . "A sustained divergence away from 0 or values close to +/- 1 "
            . "indicate a problem that ought to be investigated.\n";

        print "${f}_ent_autocorr_short.label Short term\n";
        print "${f}_ent_autocorr_short.warning -0.0078:0.0078\n";
        print "${f}_ent_autocorr_short.critical -0.009:0.009\n";
        print "${f}_ent_autocorr_short.info Short term serial correlation\n";

        print "${f}_ent_autocorr_long.label Long term\n";
        if (defined $warn{$f}{'Ent8'}) {
            print "${f}_ent_autocorr_long.warning -0.00025:0.00025\n";
            print "${f}_ent_autocorr_long.critical -0.005:0.005\n";
        }
        print "${f}_ent_autocorr_long.info Long term serial correlation\n";
    }

} #}}}

sub report_ent_values(@)
{ #{{{

    print "multigraph bb_ent\n";
    for (@_) {
        my $f   = clean_fieldname($_);
        my $ent = $json->[2]{$_}{'Ent8'} if exists $json->[2]{$_};

        if (defined $ent) {
            print "${f}_ent_entropy_short.value $ent->{'Short'}{'Current'}{'Entropy'}\n";
            print "${f}_ent_entropy_long.value $ent->{'Long'}{'Current'}{'Entropy'}\n";
        } else {
            print "${f}_ent_entropy_short.value U\n";
            print "${f}_ent_entropy_long.value U\n";
        }
    }


    for my $n ('', '16') {

        my $e = $n ? 'Ent16' : 'Ent8';

        for (@_) {
            my $f   = clean_fieldname($_);
            my $ent = $json->[2]{$_}{$e} if exists $json->[2]{$_};

            print "multigraph bb_ent.chisq${n}_$f\n";

            if (defined $ent) {
                print "${f}_ent${n}_chisq_short.value $ent->{'Short'}{'Current'}{'Chisq'}\n";
                print "${f}_ent${n}_chisq_long.value $ent->{'Long'}{'Current'}{'Chisq'}\n";
            } else {
                print "${f}_ent${n}_chisq_short.value U\n";
                print "${f}_ent${n}_chisq_long.value U\n";
            }
        }

        for (@_) {
            my $f   = clean_fieldname($_);
            my $ent = $json->[2]{$_}{$e} if exists $json->[2]{$_};

            print "multigraph bb_ent.entropy${n}_$f\n";

            if (defined $ent) {
                print "${f}_ent${n}_entropy_short.value $ent->{'Short'}{'Current'}{'Entropy'}\n";
                print "${f}_ent${n}_entropy_long.value $ent->{'Long'}{'Current'}{'Entropy'}\n";
                print "${f}_ent${n}_minentropy_short.value $ent->{'Short'}{'Current'}{'MinEntropy'}\n";
                print "${f}_ent${n}_minentropy_long.value $ent->{'Long'}{'Current'}{'MinEntropy'}\n";
            } else {
                print "${f}_ent${n}_entropy_short.value U\n";
                print "${f}_ent${n}_entropy_long.value U\n";
                print "${f}_ent${n}_minentropy_short.value U\n";
                print "${f}_ent${n}_minentropy_long.value U\n";
            }
        }

        for (@_) {
            my $f   = clean_fieldname($_);
            my $ent = $json->[2]{$_}{$e} if exists $json->[2]{$_};

            print "multigraph bb_ent.mean${n}_$f\n";

            if (defined $ent) {
                print "${f}_ent${n}_mean_short.value $ent->{'Short'}{'Current'}{'Mean'}\n";
                print "${f}_ent${n}_mean_long.value $ent->{'Long'}{'Current'}{'Mean'}\n";
            } else {
                print "${f}_ent${n}_mean_short.value U\n";
                print "${f}_ent${n}_mean_long.value U\n";
            }
        }

        for (@_) {
            my $f   = clean_fieldname($_);
            my $ent = $json->[2]{$_}{$e} if exists $json->[2]{$_};

            print "multigraph bb_ent.autocorr${n}_$f\n";

            if (defined $ent) {
                print "${f}_ent${n}_autocorr_short.value $ent->{'Short'}{'Current'}{'Autocorr'}\n";
                print "${f}_ent${n}_autocorr_long.value $ent->{'Long'}{'Current'}{'Autocorr'}\n";
            } else {
                print "${f}_ent${n}_autocorr_short.value U\n";
                print "${f}_ent${n}_autocorr_long.value U\n";
            }
        }
    }

    for (@_) {
        my $f   = clean_fieldname($_);
        my $ent = $json->[2]{$_}{'Ent8'} if exists $json->[2]{$_};

        print "multigraph bb_ent.pi_error_$f\n";

        if (defined $ent) {
            print "${f}_ent_pi_error_short.value $ent->{'Short'}{'Current'}{'Pi-error'}\n";
            print "${f}_ent_pi_error_long.value $ent->{'Long'}{'Current'}{'Pi-error'}\n";
        } else {
            print "${f}_ent_pi_error_short.value U\n";
            print "${f}_ent_pi_error_long.value U\n";
        }
    }

} #}}}


sub report_fips_pass_config(@)
{ #{{{

    print "multigraph bb_fips_pass\n";
    print "graph_title BitBabbler FIPS 140-2 pass run length\n";
    print "graph_vlabel Consecutive tests without failure\n";
    print "graph_scale no\n";
    print "graph_printf %6.0lf\n";
    print "graph_category system\n";
    print "graph_info This graph shows the run length between FIPS 140-2 test "
        . "failures.  A correctly working system should expect to see failure of "
        . "the FIPS 140-2 tests about once in every 1250 blocks tested on average."
        . "  Occasional runs of much longer than that can be reasonably expected, "
        . "with a run of 17500 or longer expected about once in 1.2 million tests "
        . "(about 3.5TB of samples).  A sustained lack of failures would indicate "
        . "a problem that ought to be investigated.\n";

    for (@_) {
        my $f = clean_fieldname($_);

        print "${f}_pass_avg_short.label $_\n";
        print "${f}_pass_avg_short.info Short term average run of tests without failure\n";
    }


    print "multigraph bb_fips_pass.longest\n";
    print "graph_title BitBabbler FIPS 140-2 longest pass run\n";
    print "graph_scale no\n";
    print "graph_printf %6.0lf\n";
    print "graph_category system\n";
    print "graph_info This graph shows the longest run of consecutive blocks "
        . "without a FIPS 140-2 test failure, since the process being queried "
        . "began.  A run of 17500 or longer is expected about once in 1.2 million "
        . "blocks tested (about 3.5TB of samples), but runs longer than that are "
        . "not impossible, just increasingly rare.  The average rate graph is a "
        . "better measure of correct operation than this one, but consistently "
        . "unusual results for the peak run length would be something that ought "
        . "to be investigated more closely.\n";

    for (@_) {
        my $f = clean_fieldname($_);

        print "${f}_pass_max.label $_\n";
        print "${f}_pass_max.info Longest run of tests without failure\n";
    }

    for (@_) {
        my $f = clean_fieldname($_);

        print "multigraph bb_fips_pass.qa_$f\n";
        print "graph_title BitBabbler $_ FIPS 140-2 pass run length\n";
        print "graph_scale no\n";
        print "graph_printf %6.0lf\n";
        print "graph_category system\n";

        print "${f}_pass_avg_short.label Short term average\n";
        print "${f}_pass_avg_short.warning 20000\n";
        print "${f}_pass_avg_short.info Average run of tests without failure\n";

        print "${f}_pass_avg_long.label Long term average\n";
        print "${f}_pass_avg_long.warning 20000\n";
        print "${f}_pass_avg_long.info Average run of tests without failure\n";
    }

} #}}}

sub report_fips_pass_values(@)
{ #{{{

    print "multigraph bb_fips_pass\n";
    for (@_) {
        my $f    = clean_fieldname($_);
        my $fips = $json->[2]{$_}{'FIPS'} if exists $json->[2]{$_};

        print "${f}_pass_avg_short.value "
            . ($fips ? $fips->{'Result'}{'PassRuns'}{'Short'} : "U") . "\n";
    }

    print "multigraph bb_fips_pass.longest\n";
    for (@_) {
        my $f    = clean_fieldname($_);
        my $fips = $json->[2]{$_}{'FIPS'} if exists $json->[2]{$_};

        print "${f}_pass_max.value "
            . ($fips ? $fips->{'Result'}{'PassRuns'}{'Peak'} : "U") . "\n";
    }

    for (@_) {
        my $f    = clean_fieldname($_);
        my $fips = $json->[2]{$_}{'FIPS'} if exists $json->[2]{$_};

        print "multigraph bb_fips_pass.qa_$f\n";

        if (defined $fips) {
            print "${f}_pass_avg_short.value $fips->{'Result'}{'PassRuns'}{'Short'}\n";
            print "${f}_pass_avg_long.value $fips->{'Result'}{'PassRuns'}{'Long'}\n";
        } else {
            print "${f}_pass_avg_short.value U\n";
            print "${f}_pass_avg_long.value U\n";
        }
    }

} #}}}


sub report_fips_fail_config(@)
{ #{{{

    print "multigraph bb_fips_fail\n";
    print "graph_title BitBabbler FIPS 140-2 testing\n";
    print "graph_vlabel Failed per 1000: long(-) / short(+) term\n";
    print "graph_scale no\n";
    print "graph_printf %6.4lf\n";
    print "graph_category system\n";
    print "graph_info This graph shows the long and short term failure rates "
        . "for the FIPS 140-2 tests on each source.  The short term average "
        . "tracks a window of the last 1000 tests.  A correctly working system "
        . "should expect to converge on just under 0.8 failures per thousand as "
        . "the long term trend, with with the short term average varying from 0 "
        . "with occasional peaks over 5 (as the rare, but not quite infinitely "
        . "improbable, rough upper bound).  A sustained short term rate greater "
        . "than that would indicate a systemic failure.\n";

    my $first = 1;

    for (@_) {
        my $f = clean_fieldname($_);

        print "${f}_l.label $_\n";
        print "${f}_l.graph no\n";
        print "${f}_l.line -0.829:bbbbbb\n" if $first;
        print "${f}_l.info Long term average rate of failures\n";

        print "${f}_s.label $_\n";
        print "${f}_s.negative ${f}_l\n";
        print "${f}_s.line 0.829:bbbbbb:Expected average rate\n" if $first;
        print "${f}_s.info Short term rolling average rate of failures\n";

        $first = 0;
    }


    for (@_) {
        my $f = clean_fieldname($_);

        print "multigraph bb_fips_fail.qa_$f\n";
        print "graph_title BitBabbler $_ average FIPS 140-2 failure rate\n";
        print "graph_vlabel Failed per 1000: long(-) / short(+) term\n";
        print "graph_scale no\n";
        print "graph_printf %6.4lf\n";
        print "graph_category system\n";
        print "graph_info This graph shows the long and short term failure rates "
            . "for the FIPS 140-2 tests.  The short term average tracks a window "
            . "of the last 1000 tests.  A correctly working system should expect "
            . "to converge on around 0.8 failures per thousand (of any test) as "
            . "the long term trend, with with the short term average varying from "
            . "0 with occasional peaks over 5 (as the rare, but not infinitely "
            . "improbable, rough upper bound). A sustained short term rate greater "
            . "than that would indicate a systemic failure. The expected (long term) "
            . "rates of failure for each individual test are indicated below.\n";

        print "${f}_l.label Failure rate\n";
        print "${f}_l.graph no\n";
        print "${f}_l.line -0.829:bbbbbb\n";

        print "${f}_s.label Failure rate\n";
        print "${f}_s.negative ${f}_l\n";
        print "${f}_s.line 0.829:bbbbbb:Expected average rate\n";
        print "${f}_s.info Failure of any test\n";
        print "${f}_s.warning 5.5\n";
        print "${f}_s.critical 10.0\n";


        print "${f}_monl.label Monobit\n";
        print "${f}_monl.graph no\n";

        print "${f}_mons.label Monobit\n";
        print "${f}_mons.negative ${f}_monl\n";
        print "${f}_mons.info Expect 0.104 per 1000\n";


        print "${f}_pokl.label Poker\n";
        print "${f}_pokl.graph no\n";

        print "${f}_poks.label Poker\n";
        print "${f}_poks.negative ${f}_pokl\n";
        print "${f}_poks.info Expect 0.099 per 1000\n";


        print "${f}_runl.label Runs\n";
        print "${f}_runl.graph no\n";

        print "${f}_runs.label Runs\n";
        print "${f}_runs.negative ${f}_runl\n";
        print "${f}_runs.info Expect 0.328 per 1000\n";


        print "${f}_lrl.label Long run\n";
        print "${f}_lrl.graph no\n";

        print "${f}_lrs.label Long run\n";
        print "${f}_lrs.negative ${f}_lrl\n";
        print "${f}_lrs.info Expect 0.298 per 1000\n";


        print "${f}_repl.label Repetition\n";
        print "${f}_repl.graph no\n";

        print "${f}_reps.label Repetition\n";
        print "${f}_reps.negative ${f}_repl\n";
        print "${f}_reps.info Expect to be very rare\n";
    }

    for (@_) {
        my $f = clean_fieldname($_);

        print "multigraph bb_fips_fail.peak_$f\n";
        print "graph_title BitBabbler $_ peak FIPS 140-2 failure rate\n";
        print "graph_vlabel Max failure rate (per 1000 tests)\n";
        print "graph_scale no\n";
        print "graph_printf %6.4lf\n";
        print "graph_category system\n";
        print "graph_info This graph shows the worst case failure rates for the "
            . "FIPS 140-2 tests since the process we are querying began.  These "
            . "are the peak values seen as the short term average over a window "
            . "of the last 1000 tests.\n";

        print "${f}_p.label Failure rate\n";
        print "${f}_p.info Failure of any test\n";

        print "${f}_monp.label Monobit\n";
        print "${f}_pokp.label Poker\n";
        print "${f}_runp.label Runs\n";
        print "${f}_lrp.label Long run\n";
        print "${f}_repp.label Repetition\n";
    }

} #}}}

sub report_fips_fail_values(@)
{ #{{{

    print "multigraph bb_fips_fail\n";
    for (@_) {
        my $f    = clean_fieldname($_);
        my $fips = $json->[2]{$_}{'FIPS'} if exists $json->[2]{$_};

        if (defined $fips) {
            print "${f}_l.value " . $fips->{'Result'}{'FailRate'}{'Long'} * 1000 . "\n";
            print "${f}_s.value " . $fips->{'Result'}{'FailRate'}{'Short'} * 1000 . "\n";
        } else {
            print "${f}_l.value U\n";
            print "${f}_s.value U\n";
        }
    }

    for (@_) {
        my $f    = clean_fieldname($_);
        my $fips = $json->[2]{$_}{'FIPS'} if exists $json->[2]{$_};

        print "multigraph bb_fips_fail.qa_$f\n";

        if (defined $fips) {
            print "${f}_l.value " . $fips->{'Result'}{'FailRate'}{'Long'} * 1000 . "\n";
            print "${f}_s.value " . $fips->{'Result'}{'FailRate'}{'Short'} * 1000 . "\n";

            print "${f}_monl.value " . $fips->{'Monobit'}{'FailRate'}{'Long'} * 1000 . "\n";
            print "${f}_mons.value " . $fips->{'Monobit'}{'FailRate'}{'Short'} * 1000 . "\n";

            print "${f}_pokl.value " . $fips->{'Poker'}{'FailRate'}{'Long'} * 1000 . "\n";
            print "${f}_poks.value " . $fips->{'Poker'}{'FailRate'}{'Short'} * 1000 . "\n";

            print "${f}_runl.value " . $fips->{'Runs'}{'FailRate'}{'Long'} * 1000 . "\n";
            print "${f}_runs.value " . $fips->{'Runs'}{'FailRate'}{'Short'} * 1000 . "\n";

            print "${f}_lrl.value " . $fips->{'Long run'}{'FailRate'}{'Long'} * 1000 . "\n";
            print "${f}_lrs.value " . $fips->{'Long run'}{'FailRate'}{'Short'} * 1000 . "\n";

            print "${f}_repl.value " . $fips->{'Repetition'}{'FailRate'}{'Long'} * 1000 . "\n";
            print "${f}_reps.value " . $fips->{'Repetition'}{'FailRate'}{'Short'} * 1000 . "\n";
        } else {
            print "${f}_l.value U\n";
            print "${f}_s.value U\n";

            print "${f}_monl.value U\n";
            print "${f}_mons.value U\n";

            print "${f}_pokl.value U\n";
            print "${f}_poks.value U\n";

            print "${f}_runl.value U\n";
            print "${f}_runs.value U\n";

            print "${f}_lrl.value U\n";
            print "${f}_lrs.value U\n";

            print "${f}_repl.value U\n";
            print "${f}_reps.value U\n";
        }
    }

    for (@_) {
        my $f    = clean_fieldname($_);
        my $fips = $json->[2]{$_}{'FIPS'} if exists $json->[2]{$_};

        print "multigraph bb_fips_fail.peak_$f\n";

        if (defined $fips) {
            print "${f}_p.value "    . $fips->{'Result'}{'FailRate'}{'Peak'} * 1000 . "\n";
            print "${f}_monp.value " . $fips->{'Monobit'}{'FailRate'}{'Peak'} * 1000 . "\n";
            print "${f}_pokp.value " . $fips->{'Poker'}{'FailRate'}{'Peak'} * 1000 . "\n";
            print "${f}_runp.value " . $fips->{'Runs'}{'FailRate'}{'Peak'} * 1000 . "\n";
            print "${f}_lrp.value "  . $fips->{'Long run'}{'FailRate'}{'Peak'} * 1000 . "\n";
            print "${f}_repp.value " . $fips->{'Repetition'}{'FailRate'}{'Peak'} * 1000 . "\n";
        } else {
            print "${f}_p.value U\n";
            print "${f}_monp.value U\n";
            print "${f}_pokp.value U\n";
            print "${f}_runp.value U\n";
            print "${f}_lrp.value U\n";
            print "${f}_repp.value U\n";
        }
    }

} #}}}


sub report_config()
{ #{{{

    my $persist = $ENV{'persist_devices'} || "no";
    my @sources;

    @sources = restore_state() if $persist eq "yes";

    eval {
        get_ids();
        @sources = unique_list(@sources, @{$json->[2]});
    };

    if (exists $ENV{'always_ignore'}) {
        my %ignore;
        my @remains;

        @ignore{split(' ',$ENV{'always_ignore'})} = ();

        for (@sources) {
            push(@remains, $_) unless exists $ignore{$_};
        }

        @sources = @remains;
    }

    save_state(@sources) if $persist eq "yes";

    @sources = unique_list(@sources, split(' ',$ENV{'always_include'})) if $ENV{'always_include'};

    report_bitrate_config(@sources);
    report_ent_config(@sources);
    report_fips_pass_config(@sources);
    report_fips_fail_config(@sources);

} #}}}

sub report_values()
{ #{{{

    get_stats();

    my @sources;

    if (($ENV{'persist_devices'} || "") eq "yes") {
        @sources = restore_state();
    } else {
        @sources = keys %{$json->[2]};

        if (exists $ENV{'always_ignore'}) {
            my %ignore;
            my @remains;

            @ignore{split(' ',$ENV{'always_ignore'})} = ();

            for (@sources) {
                push(@remains, $_) unless exists $ignore{$_};
            }

            @sources = @remains;
        }
    }

    @sources = unique_list(@sources, split(' ',$ENV{'always_include'})) if $ENV{'always_include'};

    report_bitrate_values(@sources);
    report_ent_values(@sources);
    report_fips_pass_values(@sources);
    report_fips_fail_values(@sources);

} #}}}


if (!defined $ARGV[0]) {
    report_values();
}
elsif ($ARGV[0] eq "config") {
    report_config();
}
elsif ($ARGV[0] eq "autoconf") {
    # If the package providing this is installed, we presume you're going to
    # want it enabled if munin-node is also installed.  We could make this a
    # bit more nuanced if this script is ever installed on a lot of systems
    # where that isn't likely to be true.
    print "yes\n";
}

# vi:sts=4:sw=4:et:foldmethod=marker