Add router metrics for Connectors telemetry configuration

apollo-router/src/configuration/metrics.rs

@@ -341,6 +341,8 @@ impl InstrumentData {
             "$..events.supergraph",
             opt.events.subgraph,
             "$..events.subgraph",
+            opt.events.connector,
+            "$..events.connector",
             opt.instruments,
             "$..instruments",
             opt.instruments.router,
@@ -349,6 +351,8 @@ impl InstrumentData {
             "$..instruments.supergraph",
             opt.instruments.subgraph,
             "$..instruments.subgraph",
+            opt.instruments.connector,
+            "$..instruments.connector",
             opt.instruments.graphql,
             "$..instruments.graphql",
             opt.instruments.default_attribute_requirement_level,

apollo-router/src/configuration/snapshots/apollo_router__configuration__metrics__test__metrics@telemetry.router.yaml.snap

@@ -8,10 +8,12 @@ expression: "&metrics.non_zero()"
       - value: 1
         attributes:
           opt.events: true
+          opt.events.connector: true
           opt.events.router: true
           opt.events.subgraph: true
           opt.events.supergraph: true
           opt.instruments: true
+          opt.instruments.connector: true
           opt.instruments.default_attribute_requirement_level: false
           opt.instruments.graphql: true
           opt.instruments.router: true

apollo-router/src/configuration/testdata/metrics/telemetry.router.yaml

@@ -99,6 +99,20 @@ telemetry:
               subgraph_response_data: "$.products[*].price1"
           attributes:
             subgraph.name: true
+      connector:
+        acme.user.not.found:
+          value: unit
+          type: counter
+          unit: count
+          description: "Count of 404 responses from the user API"
+          condition:
+            all:
+              - eq:
+                - 404
+                - connector_http_response_status: code
+              - eq:
+                - "user_api"
+                - connector_source: name
       graphql:
         list.length: true
         field.execution: true
@@ -174,4 +188,20 @@ telemetry:
           attributes:
             subgraph.name: true
             response_status:
-              subgraph_response_status: code
+              subgraph_response_status: code
+      connector:
+        # Standard events
+        request: off
+        response: info
+        error: error
+
+        # Custom events
+        connector.response:
+          message: "Connector response"
+          level: info
+          on: response
+          attributes:
+            connector.http.method: true
+            connector.url.template: true
+            response_status:
+              connector_http_response_status: code