[RTEMS Project] #3175: Merge FreeBSD timecounter changes from 2015-01-20 to now

[RTEMS trac]

#3175: Merge FreeBSD timecounter changes from 2015-01-20 to now
-----------------------------+------------------------------
 Reporter:  Sebastian Huber  |       Owner:  Sebastian Huber
     Type:  enhancement      |      Status:  assigned
 Priority:  normal           |   Milestone:  4.12.0
Component:  score            |     Version:  4.12
 Severity:  normal           |  Resolution:
 Keywords:                   |
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Comment (by Ed Schouten <ed@…>):

 In [changeset:"a9219e7464d4ea90d0728c40c96965699cfc39f3/rtems"
 a9219e7/rtems]:
 {{{
 #!CommitTicketReference repository="rtems"
 revision="a9219e7464d4ea90d0728c40c96965699cfc39f3"
 timecounter: Merge FreeBSD change r310053

 Add labels to sysctls related to clocks.

 Sysctls like kern.eventtimer.et.*.quality currently embed the name of
 the clock device. This is problematic for the Prometheus metrics
 exporter for two reasons:

 - Some of those clocks have dashes in their names, which Prometheus
   doesn't allow to be used in metric names.
 - It doesn't allow for extracting the same property of all clocks on the
   system from within a single query.

 Attach these nodes to have a label, so that the Prometheus metrics
 exporter gives these metric a uniform name with the name of the clock
 attached as a label.

 Reviewed by:    cem
 Differential Revision:  https://reviews.freebsd.org/D8775

 Update #3175.
 }}}

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Ticket URL: <http://devel.rtems.org/ticket/3175#comment:20>
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