Add port names to container ports

[filipdutescu]

Is your feature request related to a problem? Please describe.
The Prometheus PodMetricsEndpoint spec has deprecated the targetPort field, which would be able to take an Integer. Since the minio/tenant chart does not set names to port 9000 (which is used for metrics), I cannot move away from the deprecated field.

Unfortunately, minio appears to be moving away from that field for good, so the easiest option might be my proposal below.

Describe the solution you'd like
Define a name for the port in question. It doesn't need to be customizable via Helm, it can be static, but I would really appreciate the option to reference it by name.

Describe alternatives you've considered
Provide a PodMonitor in the Helm chart, which takes care of all of the setup, but that might be too much in terms of maintenance burden. Leaving it here as an option though.

Additional context

• PodMonitorSpec
• PodMetricsEndpoint
• ServiceMonitor endpoints port and targetPort ambiguity prometheus-operator/prometheus-operator#2515
• PodMonitor PodMetricsEndpoint port and targetPort do the same thing prometheus-operator/prometheus-operator#3071

[jiuker]

9000 is not just for metric

[filipdutescu]

That is fine, it doesn't need to be. I just want to be able to reference it by name, i.e. http-port.