slow prometheus scrapes on event persister

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#11,705 opened on Dec 19, 2023 0 comments 0 reactions 0 assignees View on GitHub

A-Metrics A-Performance S-Tolerable T-Defect

Description

This issue has been migrated from [#11705](https://github.com/matrix-org/synapse/issues/11705).

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![image](https://user-images.githubusercontent.com/1389908/148563364-9bdfd93a-1f9f-48fe-aec0-5f0cc49c6568.png)

Prometheus scrapes should *not* take two seconds. May not be a direct problem, but definitely a bad smell.

This issue has not been assessed yet.