Add a threshold for search if want to emit a metric

[Aiqin-Aiven]

in case some bad regex search defined,
it would be easier to identify the offender

The threshold is defined as threshold_for_metric_emit with default value 10 seconds.

The metric would look like this:

with regex tag on it.

[mhoffm-aiven]

What if the search never finishes though? I think this is better served by converting to using re2!

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 66.66667% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 63.32%. Comparing base (390e69b) to head (e06ad2f).
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #165      +/-   ##
==========================================
+ Coverage   63.13%   63.32%   +0.19%     
==========================================
  Files          19       19              
  Lines        2083     2094      +11     
==========================================
+ Hits         1315     1326      +11     
  Misses        768      768              

Files	Coverage Δ
journalpump/journalpump.py	64.00% <66.66%> (+0.97%)	⬆️

... and 3 files with indirect coverage changes

[Aiqin-Aiven]

ishes though? I think this is better served by converting to using re2!
We had a discussion in the team and journalpump is going to be replaced by vector, so we stick to the plan to get some metrics out.

[allhailwesttexas]

Some small comments. Also, is there any test coverage for this change?

Added some test

[RommelLayco]

i don't see the test you added

[Aiqin-Aiven]

i don't see the test you added

hmm, it was there at commit: 7d0e907, I did something wrong yesterday probably

made the change

[RommelLayco]

lgtm