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dab96a6eb1
We now also track: - Number of PS IOs in-flight - Number of pages cached by smgr prefetch implementation - IO timing histograms for LFC reads and writes, per IO issued ## Problem There's little insight into the timing metrics of LFC, and what the prefetch state of each backend is. This changes that, by measuring (and subsequently exposing) these data points. ## Summary of changes - Extract IOHistogram as separate type, rather than a collection of fields on NeonMetrics - others, see items above. Part of https://github.com/neondatabase/neon/issues/8926
neon extension consists of several parts:
shared preload library neon.so
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implements storage manager API and network communications with remote page server.
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walproposer: implements broadcast protocol between postgres and WAL safekeepers.
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control plane connector: Captures updates to roles/databases using ProcessUtility_hook and sends them to the control ProcessUtility_hook.
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remote extension server: Request compute_ctl to download extension files.
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file_cache: Local file cache is used to temporary store relations pages in local file system for better performance.
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relsize_cache: Relation size cache for better neon performance.
SQL functions in neon--*.sql
Utility functions to expose neon specific information to user and metrics collection. This extension is created in all databases in the cluster by default.