/usr/include/collectd/ is in collectd-dev 5.7.2-2ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/collectd/core/
/usr/include/collectd/core/config.h
/usr/include/collectd/core/cpython.h
/usr/include/collectd/core/daemon/
/usr/include/collectd/core/daemon/collectd.h
/usr/include/collectd/core/daemon/common.h
/usr/include/collectd/core/daemon/configfile.h
/usr/include/collectd/core/daemon/filter_chain.h
/usr/include/collectd/core/daemon/meta_data.h
/usr/include/collectd/core/daemon/plugin.h
/usr/include/collectd/core/daemon/types_list.h
/usr/include/collectd/core/daemon/utils_avltree.h
/usr/include/collectd/core/daemon/utils_cache.h
/usr/include/collectd/core/daemon/utils_complain.h
/usr/include/collectd/core/daemon/utils_heap.h
/usr/include/collectd/core/daemon/utils_ignorelist.h
/usr/include/collectd/core/daemon/utils_llist.h
/usr/include/collectd/core/daemon/utils_random.h
/usr/include/collectd/core/daemon/utils_subst.h
/usr/include/collectd/core/daemon/utils_threshold.h
/usr/include/collectd/core/daemon/utils_time.h
/usr/include/collectd/core/madwifi.h
/usr/include/collectd/core/network.h
/usr/include/collectd/core/pinba.pb-c.h
/usr/include/collectd/core/prometheus.pb-c.h
/usr/include/collectd/core/testing.h
/usr/include/collectd/core/utils_cmd_flush.h
/usr/include/collectd/core/utils_cmd_getthreshold.h
/usr/include/collectd/core/utils_cmd_getval.h
/usr/include/collectd/core/utils_cmd_listval.h
/usr/include/collectd/core/utils_cmd_putnotif.h
/usr/include/collectd/core/utils_cmd_putval.h
/usr/include/collectd/core/utils_cmds.h
/usr/include/collectd/core/utils_crc32.h
/usr/include/collectd/core/utils_curl_stats.h
/usr/include/collectd/core/utils_db_query.h
/usr/include/collectd/core/utils_dns.h
/usr/include/collectd/core/utils_fbhash.h
/usr/include/collectd/core/utils_format_graphite.h
/usr/include/collectd/core/utils_format_json.h
/usr/include/collectd/core/utils_format_kairosdb.h
/usr/include/collectd/core/utils_latency.h
/usr/include/collectd/core/utils_latency_config.h
/usr/include/collectd/core/utils_lua.h
/usr/include/collectd/core/utils_match.h
/usr/include/collectd/core/utils_mount.h
/usr/include/collectd/core/utils_parse_option.h
/usr/include/collectd/core/utils_rrdcreate.h
/usr/include/collectd/core/utils_tail.h
/usr/include/collectd/core/utils_tail_match.h
/usr/include/collectd/core/utils_vl_lookup.h
/usr/include/collectd/core/write_riemann_threshold.h
/usr/include/collectd/liboconfig/
/usr/include/collectd/liboconfig/oconfig.h