Remove pool_key label in connection pool metrics
What does this MR do and why?
This MR removes the pool_key
label in connection pool metrics.
This fix optimises the cardinality of gitlab_connection_pool_available_count and gitlab_connection_pool_size gauges. pool_key is derived from the object_id of ConnectionPool's internal variable. We can do without it.
See gitlab-com/gl-infra/scalability#3499 (closed)
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