Node_Exporter is reporting 90% CPU use by ‘Iowait - Waiting for I/O to complete’. Any ideas where to go next to diagnose this further. The Droplet is CPU-Optimised Dedicated CPU 2vCPUs 4GB 25GBHDD 4TB IO $40/mo. It’s running Docker containers for postgres, ClickhouseDB, Django, certbot, nginx, multiple GoLang, Grafana, Prometheus
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Turns out it was a corrupt table in Postgres. Diagnosed by turning off various parts of the system while watching the IO chart closely. Then turning them back on. Solution delete and re-create the offending table. And thanks KFSys for the advice too. I may well split out some of the containers onto other droplets.
I’ve never had such an issue however it seems to me like your CPU Utilization is pretty high. This means you are using more than 80 % of CPU Util with that in mind I think the best solution would be an upgrade.