Memory issue on prod fleet

[jakubgs]

Prod nodes are running out of memory regularly recently:

https://grafana.infra.status.im/d/QCTZ8-Vmk/single-host-dashboard?orgId=1&var-host=node-02.do-ams3.status.prod&from=1652555352670&to=1653592152670

This is most probably related to the recent changes in store capacity:

• f29af66e - status: increase store capacity to 1 million
• ccc074f2 - status: lower store capacity to half million
• 867c63ec - status: lowering store capacity further to 200k

It appears even 200k is too much considering everything is loaded into memory, and there's a memory leak:

• https://github.com/status-im/nwaku/issues/950
• https://github.com/status-im/nwaku/issues/978

[jakubgs]

I'm going to attempt to lower the store capacity to 100k to see if that makes a difference: https://github.com/status-im/infra-status/commit/dd76f2c2

[jakubgs]

I don't believe this is relevant any longer: