Differentiate between stores in cache metrics
What does this MR do and why?
Describe in detail what your merge request does and why.
We recently introduced two new optional redis shards that act as cache
stores. This means that now the
gitlab_cache_operation_duration_seconds
and
gitlab_cache_operations_total
metrics collect metrics for all these
stores without any disctinction, which limits the granularity of our
observability. We solve this by adding a store
label to the
aforementioned metrics.
Related to gitlab-com/gl-infra/scalability#2245 (closed)
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