[v15] Add metric to expose cluster role count #47811
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A new `teleport_roles_total` is added to count the number of roles in the cluster. The metric is intentionally updated infrequently to avoid putting any additional strain on the backend. Additionally, the reads performed when calculating the metric are rate limited to prevent any bursts in reads when the metric timer does fire. The auth periodic tickers have also been consolidated into a single multi-interval instead of a ticker per operation. To prevent the sub-intervals from impacting each other all operations are moved to their own goroutine once their ticker fires.
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fspmarshall
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strideynet
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Backport #47731 to branch/v15
changelog: Added a new teleport_roles_total metric that exposes the number of roles which exist in a cluster