OOM issue on meronense after upgrade

Noticed metrics.tpo is not getting all its updates since postgresql has been upgraded to v13.

I have started the script manually: https://gitlab.torproject.org/tpo/network-health/metrics/metrics-bin/-/blob/main/website/run-web.sh

And found out the job was being killed:

[308908.109696] oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0,global_oom,task_memcg=/user.slice/user-0.slice/session-4020.scope,task=java,pid=375579,uid=1512
[308908.109723] Out of memory: Killed process 375579 (java) total-vm:14411748kB, anon-rss:7917568kB, file-rss:0kB, shmem-rss:32kB, UID:1512 pgtables:23120kB oom_score_adj:0

cc: @gk