Add dynamic mlmd-envoy config

- Removes requirement for mlmd-grpc Service to be explicitly named `metadata-grpc-service`

Author: gmfrasca

config/internal/ml-metadata/metadata-envoy.configmap.yaml.tmpl

@@ -0,0 +1,54 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: ds-pipeline-metadata-envoy-config-{{.Name}}
+  namespace: {{.Namespace}}
+  labels:
+    app: ds-pipeline-metadata-envoy-{{.Name}}
+    component: data-science-pipelines
+data:
+    envoy.yaml: |-
+        admin:
+          access_log_path: /tmp/admin_access.log
+          address:
+            socket_address: { address: 0.0.0.0, port_value: 9901 }
+
+        static_resources:
+          listeners:
+            - name: listener_0
+              address:
+                socket_address: { address: 0.0.0.0, port_value: 9090 }
+              filter_chains:
+                - filters:
+                    - name: envoy.http_connection_manager
+                      config:
+                        codec_type: auto
+                        stat_prefix: ingress_http
+                        route_config:
+                          name: local_route
+                          virtual_hosts:
+                            - name: local_service
+                              domains: ["*"]
+                              routes:
+                                - match: { prefix: "/" }
+                                  route:
+                                    cluster: metadata-cluster
+                                    max_grpc_timeout: 0s
+                              cors:
+                                allow_origin:
+                                  - "*"
+                                allow_methods: GET, PUT, DELETE, POST, OPTIONS
+                                allow_headers: keep-alive,user-agent,cache-control,content-type,content-transfer-encoding,custom-header-1,x-accept-content-transfer-encoding,x-accept-response-streaming,x-user-agent,x-grpc-web,grpc-timeout
+                                max_age: "1728000"
+                                expose_headers: custom-header-1,grpc-status,grpc-message
+                        http_filters:
+                          - name: envoy.grpc_web
+                          - name: envoy.cors
+                          - name: envoy.router
+          clusters:
+            - name: metadata-cluster
+              connect_timeout: 30.0s
+              type: logical_dns
+              http2_protocol_options: {}
+              lb_policy: round_robin
+              hosts: [{ socket_address: { address: "ds-pipeline-metadata-grpc-{{.Name}}", port_value: {{.MLMD.GRPC.Port}} }}]

config/internal/ml-metadata/metadata-envoy.deployment.yaml.tmpl

@@ -59,3 +59,11 @@ spec:
               memory: {{.MLMD.Envoy.Resources.Limits.Memory}}
               {{ end }}
             {{ end }}
+          volumeMounts:
+            - mountPath: /etc/envoy.yaml
+              name: envoy-config
+              subPath: envoy.yaml
+      volumes:
+        - name: envoy-config
+          configMap:
+            name: ds-pipeline-metadata-envoy-config-{{.Name}}

controllers/mlmd.go

@@ -20,6 +20,7 @@ import (
 )
 
 var mlmdTemplates = []string{
+	"ml-metadata/metadata-envoy.configmap.yaml.tmpl",
 	"ml-metadata/metadata-envoy.deployment.yaml.tmpl",
 	"ml-metadata/metadata-envoy.service.yaml.tmpl",
 	"ml-metadata/metadata-grpc.deployment.yaml.tmpl",