Accept match[] in series API

[yeya24]

Signed-off-by: yeya24 [email protected]

What this PR does / why we need it:

With this match[] support, now we can query the series directly via promtool

➜  promtool query series --match='{job="varlogs"}' 'http://127.0.0.1:3100/loki'   
{filename="/var/log/syslog", job="varlogs"}
{filename="/var/log/Xorg.1.log", job="varlogs"}
{filename="/var/log/parallels.log", job="varlogs"}

Which issue(s) this PR fixes:
Fixes #1842

Special notes for your reviewer:

Checklist

• Documentation added
• Tests updated

[codecov-io]

Codecov Report

Merging #1862 into master will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1862      +/-   ##
==========================================
- Coverage   64.84%   64.82%   -0.02%     
==========================================
  Files         125      125              
  Lines        9423     9424       +1     
==========================================
- Hits         6110     6109       -1     
- Misses       2886     2887       +1     
- Partials      427      428       +1     

Impacted Files	Coverage Δ
pkg/loghttp/series.go	85.71% <100.00%> (+1.09%)	⬆️
pkg/logql/evaluator.go	90.69% <0.00%> (-0.59%)	⬇️

[cyriltovena]

Can you add a test with multiple string value from match[].

Just to ensure we support this use case where multiple matches are provided using that new match[].

Like this

curl -g 'http://localhost:9090/api/v1/series?' --data-urlencode 'match[]=up' --data-urlencode 'match[]=process_start_time_seconds{job="prometheus"}'

I think you can do that simply by adding to the array:

"match[]": []string{`{b="2", c=~"3", d!="4"}`,`{a="1"}`},

[yeya24]

Sure

[yeya24]

Close this PR because there is a better PR make by @owen-d