S11: Stats collector is not responding

Example Postgres Log Output:

LOG: using stale statistics instead of current ones because stats collector is not responding

Explanation:

PostgreSQL maintains an internal UDP connection to the "stats collector" process to write out per-table statistics and other internal metrics to the catalog statistics tables.

Sometimes this connection can timeout, causing out of date statistics and potentially other issues.

Recommended Action:

If you are seeing this as a one-off event, its typically no cause for concern.

However, if your server keeps showing this message, it might be necessary to restart the Postgres server, since the "stats collector" process can get stuck sometime, and it may cause problems if this persists for a significant amount of time.

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