3185 unify pipeline tag

[pwilczynskiclearcode]

What does this pull request do? Explain your changes.
Unifies the "pipeline" prometheus metric tag produced by AIRequestError

Fixes #3185

Checklist:

• Read the contribution guide
• make runs successfully
• All tests in ./test.sh pass
• README and other documentation updated
• Pending changelog updated

[leszko]

LGTM.

@rickstaa should we just merge it or should we notify anyone that the label is changed?

[rickstaa]

@pwilczynskiclearcode Great catch! I've implemented your suggested change to the new AI remote worker metrics functions. One additional point to consider is whether we want to ensure consistent behavior in the ai_process.go file. Currently, we're inserting a capability string instead of a pipeline string, as we are in census.go.

I'm okay with handling this discrepancy in the census package for now, but if we think it's better to also address this in the core codebase, we can include a change in a subsequent pull request. @leszko, @pwilczynskiclearcode — let me know what you think!

[rickstaa]

@pwilczynskiclearcode, @leszko we can also change pipeline string to pipelineTag string to make the behavoir more clear from outside the census package.

[leszko]

Added one commit 421aa2c

I think I like the suggestion from @rickstaa to have this conversion outside the census code. We should use pipeline naming consistently through the code.

@pwilczynskiclearcode If you like my change, feel free to merge (after all CI builds pass).

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 19 lines in your changes missing coverage. Please review.

Project coverage is 36.07820%. Comparing base (e94b188) to head (c41f3c4).
Report is 10 commits behind head on ai-video.

Files with missing lines	Patch %	Lines
server/ai_process.go	0.00000%	9 Missing ⚠️
monitor/census.go	0.00000%	8 Missing ⚠️
cmd/livepeer/starter/starter.go	0.00000%	1 Missing ⚠️
server/handlers.go	0.00000%	1 Missing ⚠️

Additional details and impacted files

@@                 Coverage Diff                  @@
##            ai-video       #3191          +/-   ##
====================================================
- Coverage   50.82671%   36.07820%   -14.74851%     
====================================================
  Files            100         124          +24     
  Lines          23769       34525       +10756     
====================================================
+ Hits           12081       12456         +375     
- Misses         11018       21381       +10363     
- Partials         670         688          +18     

Files with missing lines	Coverage Δ
cmd/livepeer/starter/starter.go	7.75695% <0.00000%> (-0.03020%)	⬇️
server/handlers.go	53.97083% <0.00000%> (ø)
monitor/census.go	61.69786% <0.00000%> (+0.12348%)	⬆️
server/ai_process.go	0.00000% <0.00000%> (ø)

... and 25 files with indirect coverage changes

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Files with missing lines	Coverage Δ
cmd/livepeer/starter/starter.go	7.75695% <0.00000%> (-0.03020%)	⬇️
server/handlers.go	53.97083% <0.00000%> (ø)
monitor/census.go	61.69786% <0.00000%> (+0.12348%)	⬆️
server/ai_process.go	0.00000% <0.00000%> (ø)

... and 25 files with indirect coverage changes