Expose number of entries in refcache as a metric. #3135
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What this PR does: Blocks-ingester uses RefCache to remember "ref" for each pushed series. RefCache is purged periodically (every 5 minutes, hardcoded), and removes series that were not used in last 10 minutes (hardcoded too). This means that number entries in the refcache roughly corresponds to active series for a user.
This PR exposes number of entries in refcache as a per-user metric.
Checklist
CHANGELOG.mdupdated - the order of entries should be[CHANGE],[FEATURE],[ENHANCEMENT],[BUGFIX]