[Bug 258393] prometheus_sysctl_exporter exports some duplicate values

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258393

            Bug ID: 258393
           Summary: prometheus_sysctl_exporter exports some duplicate
                    values
           Product: Base System
           Version: 13.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: lapo@lapo.it

It seems that prometheus_sysctl_exporter(8) exports a few duplicate values.

Example line:

% prometheus_sysctl_exporter| fgrep sysctl_vfs_zfs_l2arc_write_max
sysctl_vfs_zfs_l2arc_write_max 8388608
sysctl_vfs_zfs_l2arc_write_max 8388608

Full error as written by node_exporter in /var/log/messages (a lot of times):

error gathering metrics: 11 error(s) occurred:\n*
[from Gatherer #2] collected metric \"sysctl_vfs_zfs_l2arc_write_max\" {
untyped:<value:8.388608e+06 > } was collected before with the same name and
label values\n*
[from Gatherer #2] collected metric \"sysctl_vfs_zfs_l2arc_write_boost\" {
untyped:<value:8.388608e+06 > } was collected before with the same name and
label values\n*
[from Gatherer #2] collected metric \"sysctl_vfs_zfs_l2arc_feed_min_ms\" {
untyped:<value:200 > } was collected before with the same name and label
values\n*
[from Gatherer #2] collected metric \"sysctl_vfs_zfs_l2arc_feed_secs\" {
untyped:<value:1 > } was collected before with the same name and label
values\n*
[from Gatherer #2] collected metric \"sysctl_vfs_zfs_l2arc_headroom\" {
untyped:<value:2 > } was collected before with the same name and label
values\n*
[from Gatherer #2] collected metric \"sysctl_vfs_zfs_arc_min\" {
untyped:<value:0 > } was collected before with the same name and label
values\n*
[from Gatherer #2] collected metric \"sysctl_vfs_zfs_l2arc_feed_again\" {
untyped:<value:1 > } was collected before with the same name and label
values\n*
[from Gatherer #2] collected metric \"sysctl_vm_uma_tcp_log_bucket_size\" {
untyped:<value:30 > } was collected before with the same name and label
values\n*
[from Gatherer #2] collected metric \"sysctl_vfs_zfs_arc_max\" {
untyped:<value:0 > } was collected before with the same name and label
values\n*
[from Gatherer #2] collected metric \"sysctl_vfs_zfs_l2arc_norw\" {
untyped:<value:0 > } was collected before with the same name and label
values\n*
[from Gatherer #2] collected metric \"sysctl_vfs_zfs_l2arc_noprefetch\" {
untyped:<value:1 > } was collected before with the same name and label values

Right now I'm working around it like this:

% cat /usr/local/etc/cron.d/sysctl_exporter
*/1 * * * * root /usr/sbin/prometheus_sysctl_exporter | /usr/bin/sort -u >
/var/tmp/node_exporter/sysctl_exporter.tmp ; mv
/var/tmp/node_exporter/sysctl_exporter.tmp
/var/tmp/node_exporter/sysctl_exporter.prom

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