Improve fluentbit logfmt.

[cyriltovena]

Signed-off-by: Cyril Tovena [email protected]

This replace the custom fmt.Sprintf by a logfmt encoder making sure values with spaces are correctly quoted if needed. If the value is a complex value (map/array) it defaults to fmt.Sprintf but still use logfmt.

Fixes #1784

[codecov-io]

Codecov Report

Merging #1791 into master will increase coverage by 0.08%.
The diff coverage is 72.72%.

@@            Coverage Diff            @@
##           master   #1791      +/-   ##
=========================================
+ Coverage   64.42%   64.5%   +0.08%     
=========================================
  Files         122     122              
  Lines        9239    9242       +3     
=========================================
+ Hits         5952    5962      +10     
+ Misses       2874    2870       -4     
+ Partials      413     410       -3

Impacted Files	Coverage Δ
cmd/fluent-bit/loki.go	83.84% <72.72%> (-1.2%)	⬇️
pkg/logql/evaluator.go	91.81% <0%> (+0.58%)	⬆️
pkg/promtail/targets/filetarget.go	70.55% <0%> (+1.84%)	⬆️
pkg/promtail/targets/tailer.go	78.4% <0%> (+4.54%)	⬆️

[owen-d]

Nice catch! Love to see bugs like this get squashed.