tree 529c35ae6c1ad92cc3984a3a67bb5ab621cbb21a
parent 2bd4bc94f62fca776384a87b73f33b658b830400
author Neels Hofmeyr <neels@hofmeyr.de> 1629472178 +0200
committer Neels Hofmeyr <neels@hofmeyr.de> 1629746536 +0200

vty 'stats reset': do not reset stat_items

Exempt all stat_item statistics from 'stats reset'. Only reset rate_ctr
statistics to zero.

The rate_ctr statistics have an implicit time scale, counting occurences
per time unit. For them it makes sense to reset all ratings and start
from zero, for example in a test suite (e.g. our TTCN3 BSC_Tests).

In contrast, stat_item statistics count number of objects or nr of
specific object stati at any given time, and they do not deteriorate
over time. Many stat items depend on increment/decrement to be sane.

For example, in osmo-bsc, if the nr of connected BTS is 3, that does not
make sense to be reset to zero. There are still 3 BTS connected, only
the stat_item would suddenly reflect zero. From then on, it'd be wrong.

All stat_items are by definition wrong after a 'stats reset'.
- Those that depend on increment/decrement will be wrong until the
  program exits, and
- those that are set to absolute values will be wrong up until the next
  value is set. That could be seconds or hours later, depending.

Related: SYS#5542
Change-Id: If2134768b1076e7af189276c45f2a09a4944303e