The problem I've heard this question come up many times over the years, and I've been involved in quite a few discussions about it myself: how do you collect metrics from an application running in a container if the application doesn't expose an HTTP /metrics endpoint? Maybe it was never designe...
Source: [Dev.to](https://dev.to/denis_fomenkov/metricshell-how-we-tried-to-solve-the-metrics-problem-for-short-lived-containers-nc0)