meronense performance problems (out of memory?)

nagios@hetzner-hel1-01.torproject.org (Today 06:32) (nagios rapports tor)
Subject: ** PROBLEM Service Alert: meronense/swap usage - mb is CRITICAL **
To: anarcat+rapports@orangeseeds.org
Date: Wed, 27 Oct 2021 10:32:49 +0000

***** Icinga *****

Notification Type: PROBLEM

Service: swap usage - mb
Host: meronense
Address: 49.12.57.134
State: CRITICAL

Date/Time: Wed Oct 27 10:32:49 UTC 2021

Additional Info:

SWAP CRITICAL - 0% free (0 MB out of 4095 MB)

also @hiro reported:

11:01:36 <hiro> the webstats postgresql on meronense is incredibly slow what do you think we could do to speed it up a bit?

... somewhat at the sasme time.