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Closes https://github.com/sourcegraph/sourcegraph/issues/17070

• All services now export a Gauge, src_service_metadata, indicating their Sourcegraph version (and possibly other metadata in the future)
  • There's precedent for this usage of Gauge, see monitoring: export Sourcegraph version as metric, render annotation in Grafana on version changes #17070
• Add a (currently disabled by default) annotation layer for each service that adds an annotation per version/instance when version labels change.
• Add a (currently disabled by default) annotation layer for each service that shows all service alerts

Open to ideas for annotation formatting (also considering v{{ version }} detected, etc.)

Treating this mostly as a first-pass - I think we can add additional things like links, etc and maybe do better grouping/formatting based on how this looks in dogfood and Cloud

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Notifying subscribers in CODENOTIFY files for diff fa28c07...fb86e02 .

Codecov Report

Merging #17198 ( fb86e02 ) into main ( fa28c07 ) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main   #17198      +/-   ##
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- Coverage   51.99%   51.98%   -0.01%     
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  Files        1703     1703
  Lines       84804    84804
  Branches     7609     7679      +70
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- Hits        44095    44087       -8     
- Misses      36807    36815       +8     
  Partials     3902     3902              

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