How to push Reactjs logs and metrics to Grafana

user_14016151 0
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Background:

I am working on a project where we have a server setup in Java and for front-end we are using ReactJs. Our server ships all logs to Loki endpoint via their push API and all metrics to a prometheus push-gateway. Grafana then pulls those logs and metrics from Loki and push-gateway for display.

Requirement:

I want to persist and place the ReactJs application logs and metrics so they are visible on grafana. This will help us see both frontend and backend application logs & metrics in the same place. Is there a free, opensource Javascript library or framework that can help me with that. The less code I need to write the better.

I was opting for sentry before but it's not completely free anymore. And we cannot use console logging as it disappears on browser refresh and not really helpful in production

grafana-loki grafana reactjs logging javascript
1 Answers

So I didn't find a good library at that time but I was eventually able to ship logs to loki push endpoint.

I tried to push logs directly from frontend to loki push endpoint. This gave me a cors error. So I came up with the following steps to get around cors with Loki.

My workaround:

  1. Setup nginx proxy server.
  2. Nginx resolves cors.
  3. Add reverse proxy to nginx. I send request to nginx host and then it forwards that request to loki from within same network so no cors.

I took alot of reading and hit and trys but I got the setup working. We are now using this setup to push frontend logs to grafana

user_140161510
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