Change in libosmocore[master]: refactor stat_item: get rid of FIFO and "skipped" error

[neels]

Hello Jenkins Builder, daniel, 

I'd like you to reexamine a change. Please visit

    https://gerrit.osmocom.org/c/libosmocore/+/25464

to look at the new patch set (#2).

Change subject: refactor stat_item: get rid of FIFO and "skipped" error
......................................................................

refactor stat_item: get rid of FIFO and "skipped" error

Intead of attempting to store all distinct values of a reporting period,
just store min, max, last as well as a sum and N of each reporting
period.

This gets rid of error messages like

  DLSTATS ERROR stat_item.c:285 num_bts:oml_connected: 44 stats values skipped

while at the same time more accurately reporting the max value for each
reporting period. (So far stats_item only reports the max value; keep
that part unchanged, as shown in stats_test.c.)

With the other so far unused values (min, sum), we are ready to also
report the minimum value as well as an average value per reporting
period in the future, if/when our stats reporter allows for it.

Store the complete record of the previous reporting period. So far we
only compare the 'max' value, but like this we are ready to also see
changes in min, last and average value between reporting periods.

Related: SYS#5542
Change-Id: I137992a5479fc39bbceb6c6c2af9c227bd33b39b
---
M TODO-RELEASE
M include/osmocom/core/stat_item.h
M src/stat_item.c
M src/stats.c
M tests/stats/stats_test.c
M tests/stats/stats_test.err
6 files changed, 315 insertions(+), 269 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/64/25464/2
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Gerrit-Project: libosmocore
Gerrit-Branch: master
Gerrit-Change-Id: I137992a5479fc39bbceb6c6c2af9c227bd33b39b
Gerrit-Change-Number: 25464
Gerrit-PatchSet: 2
Gerrit-Owner: neels <nhofmeyr at sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: daniel <dwillmann at sysmocom.de>
Gerrit-CC: pespin <pespin at sysmocom.de>
Gerrit-MessageType: newpatchset
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