The default metrics sent by Istio are useful to get an idea on how the traffic flows in your cluster. However, to understand how your application behaves, you also need application metrics.
Prometheus has client libraries that you can use to instrument your application and send those metrics. This is good but it raises some questions:
- Where do you collect those metrics?
- Do you use Istio’s Prometheus or set up your own Prometheus?
- If you use Istio’s Prometheus, what configuration do you need to get those metrics scraped?
Let’s try to answer these questions.
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