This file is indexed.

/etc/apt/apt.conf.d/50appstream is in appstream 0.12.0-3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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## This file is provided by appstreamcli(1) to download DEP-11
## metadata files.

Acquire::IndexTargets {
    # The YAML metadata files
    deb::DEP-11  {
        MetaKey "$(COMPONENT)/dep11/Components-$(NATIVE_ARCHITECTURE).yml";
        ShortDescription "Components-$(NATIVE_ARCHITECTURE)";
        Description "$(RELEASE)/$(COMPONENT) $(NATIVE_ARCHITECTURE) DEP-11 Metadata";

        KeepCompressed "true";
        KeepCompressedAs "gz";
    };

    # Small icons for GUI components described in the DEP-11
    # YAML metadata.
    deb::DEP-11-icons-small  {
        MetaKey "$(COMPONENT)/dep11/icons-48x48.tar";
        ShortDescription "icons-48x48";
        Description "$(RELEASE)/$(COMPONENT) DEP-11 48x48 Icons";

        KeepCompressed "true";
        KeepCompressedAs "gz";
        DefaultEnabled "false";
    };

    # Normal-sized icons for GUI components described in the DEP-11
    # YAML metadata.
    deb::DEP-11-icons  {
        MetaKey "$(COMPONENT)/dep11/icons-64x64.tar";
        ShortDescription "icons-64x64";
        Description "$(RELEASE)/$(COMPONENT) DEP-11 64x64 Icons";

        KeepCompressed "true";
        KeepCompressedAs "gz";
        DefaultEnabled "false";
    };

    # Icons suitable for HiDPI displays, for GUI components described in
    # the DEP-11 YAML metadata.
    deb::DEP-11-icons-hidpi  {
        MetaKey "$(COMPONENT)/dep11/icons-64x64@2.tar";
        ShortDescription "icons-64x64@2";
        Description "$(RELEASE)/$(COMPONENT) DEP-11 64x64@2 Icons";

        KeepCompressed "true";
        KeepCompressedAs "gz";
        DefaultEnabled "false";
    };

    # Larger icons that are often used on HiDPI displays as fallback.
    deb::DEP-11-icons-large  {
        MetaKey "$(COMPONENT)/dep11/icons-128x128.tar";
        ShortDescription "icons-128x128";
        Description "$(RELEASE)/$(COMPONENT) DEP-11 128x128 Icons";

        KeepCompressed "true";
        KeepCompressedAs "gz";
        DefaultEnabled "false";
    };

    # Even larger icons that are used on HiDPI displays.
    deb::DEP-11-icons-large-hidpi {
        MetaKey "$(COMPONENT)/dep11/icons-128x128@2.tar";
        ShortDescription "icons-128x128@2";
        Description "$(RELEASE)/$(COMPONENT) DEP-11 128x128@2 Icons";

        KeepCompressed "true";
        KeepCompressedAs "gz";
        DefaultEnabled "false";
    };
};

# Refresh AppStream cache when APT's cache is updated (i.e. apt update)
APT::Update::Post-Invoke-Success {
    "if /usr/bin/test -w /var/cache/app-info -a -e /usr/bin/appstreamcli; then appstreamcli refresh-cache > /dev/null; fi";
};