Commits on Apr 4, 2023

1. tsdb: add tenant-level store metrics to tsdb …

   Previously, while we had the ability to show tenant-level
   store metrics in the `/_status/vars` page, these metrics
   were never written to tsdb.
   
   This is despite the changes in cockroachdb#98077,
   which did a great job at writing all the metrics in the
   tenant-specific metric registries, but didn't pull the
   tenant-specific store metrics out of the store registries.
   This is because these metrics exist as *child* metrics on
   the store registry metrics, and we did not previously have
   logic to individually pick these metrics out of their
   parent AggGauge/Counter metrics.
   
   This patch adds the logic to do so. Now, for each tenant
   ID that exists in the recorder's `tenantRegistries` map,
   we will attempt to pick that tenant's individual child
   metric & values from all the metrics that exist in
   TenantsStorageMetrics. This will limit the writing
   of these tenant-level metrics to only happen in deployments
   where multiple tenants are running in-process, as environments
   such as serverless clusters are expected to have an empty
   `tenantRegistries` map in this recorder.
   
   Release note: none

   

   Alex Barganier authored and abarganier committed Apr 4, 2023
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