Ambassador Host Source doesn't use the annotation filter

[KyleMartin901]

What happened:

When two External-DNS deployments have the ambassador-host source enabled and the annotation filter set if a Ambassador Host resource contains an annotation that matches the annotation filter it has no effect. The first External-DNS deployment to process the Ambassador Host resource is the one that will own the DNS records even if the annotation filter doesn't match.

What you expected to happen:

Only the External-DNS deployment that matches the annotation filter will create the DNS records for the Ambassador Host resource.

How to reproduce it (as minimally and precisely as possible):

Deploy 1 External-DNS deployment with annotation filter set and ambassador-host source enabled. Deploy Ambassador Host resource with different annotation set.

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: external-dns-private
spec:
  strategy:
    type: Recreate
  selector:
    matchLabels:
      app: external-dns-private
  template:
    metadata:
      labels:
        app: external-dns-private
      annotations:
        iam.amazonaws.com/role: {ARN} # AWS ARN role
    spec:
      serviceAccountName: external-dns
      containers:
      - name: external-dns
        image: k8s.gcr.io/external-dns/external-dns:latest
        args:
        - --source=ambassador-host
        - --domain-filter=example.net # will make ExternalDNS see only the hosted zones matching provided domain, omit to process all available hosted zones
        - --provider=aws
        - --policy=upsert-only # would prevent ExternalDNS from deleting any records, omit to enable full synchronization
        - --aws-zone-type=private # only look at public hosted zones (valid values are public, private or no value for both)
        - --registry=txt
        - --txt-owner-id= {Hosted Zone ID} # Insert Route53 Hosted Zone ID here
        - --annotation-filter=kubernetes.io/ingress.class in (private)
---
apiVersion: getambassador.io/v3alpha1
  kind: Host
  metadata:
    name: your-hostname
    annotations:
      external-dns.ambassador-service: emissary-ingress/emissary
      kubernetes.io/ingress.class: public
  spec:
		acmeProvider:
      authority: none
		hostname: your-hostname.example.com

Anything else we need to know?:

Environment:

• External-DNS version (use external-dns --version): v0.10.2
• DNS provider: AWS Route53
• Others: Ambassador Host source

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/remove-lifecycle stale

[k8s-triage-robot]

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/remove-lifecycle stale

[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all issues and PRs.

This bot triages issues and PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
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/lifecycle stale

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/remove-lifecycle stale

[k8s-triage-robot]

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This bot triages un-triaged issues according to the following rules:

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/remove-lifecycle stale

[k8s-triage-robot]

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[KyleMartin901]

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[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
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[KyleMartin901]

/remove-lifecycle rotten

[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
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Please send feedback to sig-contributor-experience at kubernetes/community.

/lifecycle stale

[KyleMartin901]

/remove-lifecycle stale