How to handle "Failed to load report data" 504 errors (other than tweaking the nginx timeouts)?

[kastl-ars]

Dear maintainers,

I did not want to derail the nginx-focused discussion in #40, hence this separate issue.

I am getting the dreaded "Failed to load report data. Request failed with status code 504" error in our clusters when looking at something like "Last 7 days". Smaller time periods like 1 or 2 days work, but above that it is a vabanque game.

Is there any way to fix this? I already increased the timeouts in the nginx configuration (that I need to mount as a configMap in OpenShift anyway) and in the ingress / route configuration.

Ideally we would be able to get the data for the last month, but that seems out of the question currently if just a period of some days already fails.

Any ideas, tips and tricks would be highly appreciated.

Kind Regards