feat: backport service instances table #16819
Merged
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Description
The service instances table was added to 1.15.0 which keeps a record of the number of service instances per cluster.
For Census reporting the service instances metrics depends on this table which needs to be backported to 1.14.x and 1.13.x versions.
Testing & Reproduction steps
None
Links
Related 1.15.0 PR: #16205
PR Checklist
updated test coverageexternal facing docs updatednot a security concern