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This patch introduces a new set of grafana metrics for a histogram:
pageserver_get_vectored_seconds_bucket{task_kind="Compaction|PageRequestHandler"}.
While it has a `task_kind` label, only compaction and SLRU fetches are
tracked. This reduces the increase in cardinality to 24.
The metric should allow us to isolate performance regressions while the
vectorized get is being implemented. Once the implementation is
complete, it'll also allow us to quantify the improvements.