Expose annotations for service

[lookcrabs]

Description

This just adds a section to expose annotations for the cortex-tenant service. This will allow people, like me :P, to use aws-lb-controller to automatically expose it to a VPC via a nlb/alb/etc as well as use externaldns to define an route53 entry etc.

example:

• annotations.yaml

service:
  annotations:
    external-dns.alpha.kubernetes.io/hostname: cortex-tenant.internaldns.io
    service.beta.kubernetes.io/aws-load-balancer-additional-resource-tags: Name=cortex-tenant, Service=mimir, Environment=staging, Role=reverse-proxy
    service.beta.kubernetes.io/aws-load-balancer-name: mimir-ctxproxy  # Name the NLB

• without annotations.yaml:

$ helm template cortex-proxy . -f values.yaml | yq 'select(.kind == "Service")'
# Source: cortex-tenant/templates/service.yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    helm.sh/chart: cortex-tenant-0.8.0
    app.kubernetes.io/name: cortex-tenant
    app.kubernetes.io/instance: cortex-proxy
    app.kubernetes.io/version: "1.13.0"
    app.kubernetes.io/managed-by: Helm
  name: cortex-proxy-cortex-tenant
  annotations: {}
spec:
  type: ClusterIP
  ports:
    - name: http
      port: 8080
      targetPort: 8080
      protocol: TCP
  selector:
    app.kubernetes.io/name: cortex-tenant
    app.kubernetes.io/instance: cortex-proxy

• with annotations.yaml:

$ helm template cortex-proxy . -f values.yaml -f annotations.yaml| yq 'select(.kind == "Service")'
# Source: cortex-tenant/templates/service.yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    helm.sh/chart: cortex-tenant-0.8.0
    app.kubernetes.io/name: cortex-tenant
    app.kubernetes.io/instance: cortex-proxy
    app.kubernetes.io/version: "1.13.0"
    app.kubernetes.io/managed-by: Helm
  name: cortex-proxy-cortex-tenant
  annotations:
    external-dns.alpha.kubernetes.io/hostname: cortex-tenant.internaldns.io
    service.beta.kubernetes.io/aws-load-balancer-additional-resource-tags: Name=cortex-tenant, Service=mimir, Environment=staging, Role=reverse-proxy
    service.beta.kubernetes.io/aws-load-balancer-name: mimir-ctxproxy  # Name the NLB
spec:
  type: ClusterIP
  ports:
    - name: http
      port: 8080
      targetPort: 8080
      protocol: TCP
  selector:
    app.kubernetes.io/name: cortex-tenant
    app.kubernetes.io/instance: cortex-proxy