# What this PR does
Prepare insight metrics for adding `service_name` label.
This PR updates metrics cache structure, supporting both old and new
version of cache.
`service_name` label can be added with additional PR when all metric
cache is updated.
## Which issue(s) this PR closes
https://github.com/grafana/oncall-private/issues/2610
## Checklist
- [x] Unit, integration, and e2e (if applicable) tests updated
- [x] Documentation added (or `pr:no public docs` PR label added if not
required)
- [x] Added the relevant release notes label (see labels prefixed w/
`release:`). These labels dictate how your PR will
show up in the autogenerated release notes.
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