how to connect Kong prometheus plugin to Grafana using docker?

Question

I'm using Kong with KONGA as GUI and added Prometheus plugin for monitoring, however when I try to add the data source to Grafana using Kong endpoint http://host.docker.internal:8001/metrics I always get the below error

Error reading Prometheus: client_error: client error: 404.

How can I connect Grafana data source to localhost:8001/metrics?

Answer 1

Ok, you have one missing piece in your architecture. You need to add Prometheus as well which will scrape the metrics from Kong. This is the architecture you should have:

Kong metrics (8001/metrics) -> Prometheus (9090) -> Grafana

The metrics from Kong will be ingested by Prometheus from time to time and used to create a series database of the metrics obtained.

You will then add Prometheus as a data source in Grafana which will then make all the metrics collected by Prometheus available to Grafana for viewing in a dashboard. Here is the official dashboard for Kong.