stat counter glitch caused by the restart

[vthriller]

Classification (Please choose one option):

Other bug

Reproducibility (Please choose one option):

Sometimes

Rspamd version:

1.6.2, 1.7.0-git.8802590ef

Operation system, CPU, memory and environment:

Ubuntu 14.04

Description (Please provide a descriptive summary of the issue):

Counters acquired through the /stat are sometimes getting slightly backtracked after restart. This can be seen with external monitoring system that collects its output (Prometheus in this case):

This is a problem for a wide range of tools from e.g. rrdtool (through COUNTER) to Prometheus (rate()), as they consider backtracking as a reset counter and adjust to that accordingly:

Not all restarts are causing that though.

There are two possible solutions here:

• try harder keeping counter values through restarts,
• reset counters to 0 altogether with every restart (any descent monitoring system will cope with that just fine).

Steps to reproduce:

service rspamd restart

[stale]

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