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## Problem The `pageserver_smgr_query_seconds` buckets are too coarse, using powers of 10: 1 µs, 10 µs, 100 µs, 1 ms, 10 ms, 100 ms, 1 s, 10 s, 100 s. This is one of our most crucial latency metrics, and needs better resolution. Touches #11594. ## Summary of changes This patch uses buckets with better resolution around 1 ms (the typical latency): * 0.6 ms * 1 ms * 3 ms * 6 ms * 10 ms * 30 ms * 100 ms * 1 s * 3 s These will be the same as the compute's `compute_getpage_wait_seconds`, to make them comparable across the compute and Pageserver: https://github.com/neondatabase/flux-fleet/pull/579. We sacrifice buckets above 3 s, since these can already be considered "too slow". This does not change the previously used `CRITICAL_OP_BUCKETS`, which is also used for other operations on different timescales (e.g. LSN waits). We should consider replacing this with more appropriate buckets for specific operations, since it covers a large span with low resolution.