feat: introduce new service.criticality attribute (#2986)

[bachgarash]

Fixes #2986

This PR introduces a new attribute - service.criticality

Relevant discussion has been made during Service and Deployment Semconv SIG meet

Meet notes https://docs.google.com/document/d/1Fy6yXfZqrwN_oHw95Bdfg_0hzUgzlk3VO5wA1invgkI/edit?tab=t.0

Recording can be found https://docs.google.com/spreadsheets/d/1SYKfjYhZdm2Wh2Cl6KVQalKg_m4NhTPZqq-8SzEVO6s/edit?gid=0#gid=0 (6th of November)

Changes

This PR introduces a new semantic convention attribute service.criticality to enable classification of services based on their operational importance. This attribute will allow observability platforms to implement criticality-aware tracing, and sampling strategies.

Important

Pull requests acceptance are subject to the triage process as described in Issue and PR Triage Management.
PRs that do not follow the guidance above, may be automatically rejected and closed.

Merge requirement checklist

• CONTRIBUTING.md guidelines followed.
• Change log entry added, according to the guidelines in When to add a changelog entry.
  • If your PR does not need a change log, start the PR title with [chore]
• Links to the prototypes or existing instrumentations (when adding or changing conventions)

[bachgarash]

Links to the prototypes or existing instrumentations (when adding or changing conventions)

I need help with guidance on how to provide prototype for a newly introduced semantic convention attribute. Please, feel free drop your idea. Thanks in advance!

[jsuereth]

Note: The build is failing - My approval is for the proposed change, but please clean up the build and get all tests to pass. I believe this needs a make table-generation registry-generation pass at a minimum, and possibly other cleanups .

[thompson-tomo]

@bachgarash can you regenerate the docs to take on the changes to the documentation templates?

[bachgarash]

Hi there. I have added a basic prototype into Otel-demo as requested

open-telemetry/opentelemetry-demo#2770

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: bachgarash / name: Bəxtiyar (3a066a1, 7e9b3a1, a93a6f0, bf07d66, eeb4735, eff768d)