As a quick update, Google Cloud is now recommending to increase the performance of our Discourse instance due to “high memory utilization”:
This instance has had high memory utilization recently. Consider switching to the machine type: custom (1 vCPU, 2.75 GB memory). Learn more
Current machine type
g1-small (1 vCPU, 1.7 GB memory)New machine type
custom (1 vCPU, 2.75 GB memory) Recommended
But as we haven’t noticed any performance problems ourselves, we haven’t upgraded yet. (Just thought it would be useful to mention the hint here.) So we’ll be paying more attention to memory going forward, and I’ll update this post if we end up doing the suggested upgrade.