Prometheus scraping does not work when mTLS is enabled

Port 15020 must be excluded from inbound proxy ports when scraping is enabled to allow prometheus to scrape metrics on pods with injected sidecars.

To workaround the problem, the following snippet can be added to the smcp config:

spec:
  proxy:
    networking:
      trafficControl:
        inbound:
          excludedPorts:
          - 15020