Sets query.sd-dns-resolver=miekgdns for thanos-querier and thanos-ruler

Issue: https://issues.redhat.com/browse/OCPBUGS-5153

Problem: a downstream commit was made to make this the default because
of https://bugzilla.redhat.com/show_bug.cgi?id=1953518. However, this
commit conflicts when updating the downstream brach.

Solution: migrate default to jsonnet

Signed-off-by: JoaoBraveCoding <[email protected]>

Author: JoaoBraveCoding

Diff for: assets/thanos-querier/deployment.yaml

@@ -61,6 +61,7 @@ spec:
         - --grpc-client-server-name=prometheus-grpc
         - --rule=dnssrv+_grpc._tcp.prometheus-operated.openshift-monitoring.svc.cluster.local
         - --target=dnssrv+_grpc._tcp.prometheus-operated.openshift-monitoring.svc.cluster.local
+        - --query.sd-dns-resolver=miekgdns
         env:
         - name: HOST_IP_ADDRESS
           valueFrom:

Diff for: assets/thanos-ruler/thanos-ruler.yaml

@@ -20,7 +20,9 @@ spec:
     key: alertmanagers.yaml
     name: thanos-ruler-alertmanagers-config
   containers:
-  - name: thanos-ruler
+  - args:
+    - --query.sd-dns-resolver=miekgdns
+    name: thanos-ruler
     securityContext:
       allowPrivilegeEscalation: false
       capabilities:

Diff for: jsonnet/components/thanos-querier.libsonnet

@@ -356,6 +356,10 @@ function(params)
                   '--grpc-client-server-name=prometheus-grpc',
                   '--rule=dnssrv+_grpc._tcp.prometheus-operated.openshift-monitoring.svc.cluster.local',
                   '--target=dnssrv+_grpc._tcp.prometheus-operated.openshift-monitoring.svc.cluster.local',
+                  // The native Go resolver fails to parse compressed responses for SRV records.
+                  // The miekgdns resolver doesn't suffer the same issue hence defaulting to it instead.
+                  // See https://bugzilla.redhat.com/show_bug.cgi?id=1953518
+                  '--query.sd-dns-resolver=miekgdns',
                 ],
                 resources: {
                   requests: {

Diff for: jsonnet/components/thanos-ruler.libsonnet

@@ -385,6 +385,12 @@ function(params)
             // Note: this is performing strategic-merge-patch for thanos-ruler container.
             // Remainder of the container configuration is managed by prometheus-operator based on $.thanosRuler.spec
             name: tr.config.name,
+            args: [
+              // The native Go resolver fails to parse compressed responses for SRV records.
+              // The miekgdns resolver doesn't suffer the same issue hence defaulting to it instead.
+              // See https://bugzilla.redhat.com/show_bug.cgi?id=1953518
+              '--query.sd-dns-resolver=miekgdns',
+            ],
             terminationMessagePolicy: 'FallbackToLogsOnError',
             volumeMounts: [
               {