[Feature]: Ability to set metrics port

[miroslavmasaryk3221]

Requirement

Requirement
As a jaeger helm chart user, I would like to change exporter port with name admin for all microservices e.g agent to a custom one

Problem

In our environment we need to change it to 9100 for telegraf, because of specific usecase, telegraf config cannot be adopted.
So solution would be to change admin port and also adjust exporter configuration.

For exporter configuration I guess this needs to be changed inside of the image so that it can be then changed as value in values.yaml

ports:
- name: zipkin-compact
  containerPort: {{ .Values.agent.service.zipkinThriftPort }}
  protocol: UDP
  {{- if .Values.agent.daemonset.useHostPort }}
  hostPort: {{ .Values.agent.service.zipkinThriftPort }}
  {{- end }}
- name: jaeger-compact
  containerPort: {{ .Values.agent.service.compactPort }}
  protocol: UDP
  {{- if .Values.agent.daemonset.useHostPort }}
  hostPort: {{ .Values.agent.service.compactPort }}
  {{- end }}
- name: jaeger-binary
  containerPort: {{ .Values.agent.service.binaryPort }}
  protocol: UDP
  {{- if .Values.agent.daemonset.useHostPort }}
  hostPort: {{ .Values.agent.service.binaryPort }}
  {{- end }}
- name: http
  containerPort: {{ .Values.agent.service.samplingPort }}
  protocol: TCP
  {{- if .Values.agent.daemonset.useHostPort }}
  hostPort: {{ .Values.agent.service.samplingPort }}
  {{- end }}
- name: admin
  # here this should be changed 
  containerPort: 14271
  protocol: TCP

Proposal

Example for agent

ports:
- name: zipkin-compact
  containerPort: {{ .Values.agent.service.zipkinThriftPort }}
  protocol: UDP
  {{- if .Values.agent.daemonset.useHostPort }}
  hostPort: {{ .Values.agent.service.zipkinThriftPort }}
  {{- end }}
- name: jaeger-compact
  containerPort: {{ .Values.agent.service.compactPort }}
  protocol: UDP
  {{- if .Values.agent.daemonset.useHostPort }}
  hostPort: {{ .Values.agent.service.compactPort }}
  {{- end }}
- name: jaeger-binary
  containerPort: {{ .Values.agent.service.binaryPort }}
  protocol: UDP
  {{- if .Values.agent.daemonset.useHostPort }}
  hostPort: {{ .Values.agent.service.binaryPort }}
  {{- end }}
- name: http
  containerPort: {{ .Values.agent.service.samplingPort }}
  protocol: TCP
  {{- if .Values.agent.daemonset.useHostPort }}
  hostPort: {{ .Values.agent.service.samplingPort }}
  {{- end }}
- name: admin
  # here this should be changed 
  containerPort: {{ .Values.agent.service.metricsPort }}
  protocol: TCP

Open questions

Nothing