nbari / pg_exporter / 34322190537

90%

main: 90%

Build Type

push

github

Committed by nbari

Commit Message

Fix process-group memory counting shared_buffers once per backend

The default rss source summed statm resident pages across all postgres
processes, so shared_buffers was charged to every backend that touched
it: 312 GiB reported on a 93.8 GiB host with 208 backends (issue #36).

Read resident minus shared from the same statm line instead, so the
gauge reports the group's private memory — the part that actually grows
with work_mem, sorts and hash joins. Same single read per process, same
O(processes) cost, and the pss opt-in keeps working with the private
figure as its fallback.

Also update the CLI help, collector docs, Grafana panel and legend to
describe the private-memory semantics.

Fix #36

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12 existing lines in 5 files now uncovered.

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