Add validation for otlp destination protocol

charts/k8s-monitoring/schema-mods/types-and-enums.json

@@ -49,7 +49,8 @@
             }, "required": ["key", "action"]
           }}
         }}
-      }}
+      }},
+      "protocol": {"enum": ["grpc", "http"]}
     }},
     "prometheus-destination": {"properties": {
       "auth": {"properties": {

charts/k8s-monitoring/templates/destinations/_destination_validations.tpl

@@ -3,11 +3,17 @@
 {{- define "destinations.validate" }}
   {{- range $i, $destination := .Values.destinations }}
     {{- if not $destination.name }}
-      {{ fail (printf "\nDestination #%d does not have a name.\nPlease set:\ndestinations:\n  - name: my-destination-name" $i) }}
+      {{- $msg := list "" (printf "Destination #%d does not have a name." $i) }}
+      {{- $msg = append $msg "Please set:" }}
+      {{- $msg = append $msg "destinations:" }}
+      {{- $msg = append $msg "  - name: my-destination-name" }}
+      {{- fail (join "\n" $msg) }}
     {{- end }}
 
     {{- if (regexFind "[^-_ a-zA-Z0-9]" $destination.name) }}
-      {{ fail (printf "\nDestination #%d (%s) has invalid characters in its name.\nPlease only use alphanumeric, underscores, dashes, or spaces" $i $destination.name) }}
+      {{- $msg := list "" (printf "Destination #%d (%s) invalid characters in its name." $i $destination.name) }}
+      {{- $msg = append $msg "Please only use alphanumeric, underscores, dashes, or spaces." }}
+      {{- fail (join "\n" $msg) }}
     {{- end }}
 
     {{- $types := (include "destinations.types" . ) | fromYamlArray }}
@@ -19,6 +25,17 @@
       {{ fail (printf "\nDestination #%d (%s) is using an unknown type (%s).\nPlease set:\ndestinations:\n  - name: %s\n    type: \"[%s]\"" $i $destination.name $destination.type $destination.name (include "english_list_or" $types)) }}
     {{- end }}
 
+    {{- if and (eq $destination.type "otlp") (not (has ($destination.protocol | default "grpc") (list "grpc" "http"))) }}
+      {{- $msg := list "" (printf "Destination #%d (%s) has an unsupported protocol: %s." $i $destination.name $destination.protocol) }}
+      {{- $msg = append $msg "The protocol must be either \"grpc\" or \"http\"" }}
+      {{- $msg = append $msg "Please set:" }}
+      {{- $msg = append $msg "destinations:" }}
+      {{- $msg = append $msg (printf "  - name: %s" $destination.name) }}
+      {{- $msg = append $msg "    type: otlp" }}
+      {{- $msg = append $msg "    protocol: otlp / http" }}
+      {{- fail (join "\n" $msg) }}
+    {{- end }}
+
     {{/* Check if OTLP destination using Grafana Cloud OTLP gateway has protocol set */}}
     {{- if and (eq $destination.type "otlp") (ne $destination.protocol "http") (regexMatch "otlp-gateway-.+grafana\\.net" $destination.url) }}
       {{ fail (printf "\nDestination #%d (%s) is using Grafana Cloud OTLP gateway but has incorrect protocol '%s'. The gateway requires 'http'.\nPlease set:\ndestinations:\n  - name: %s\n    type: otlp\n    url: %s\n    protocol: http" $i $destination.name ($destination.protocol | default "grpc (default)") $destination.name $destination.url) }}

charts/k8s-monitoring/tests/destination_validations_test.yaml

@@ -29,8 +29,8 @@ tests:
       - failedTemplate:
           errorMessage: |-
             execution error at (k8s-monitoring/templates/validations.yaml:5:4): 
-            Destination #0 (prøm3thüs!) has invalid characters in its name.
-            Please only use alphanumeric, underscores, dashes, or spaces
+            Destination #0 (prøm3thüs!) invalid characters in its name.
+            Please only use alphanumeric, underscores, dashes, or spaces.
 
   - it: requires a destination type
     set:
@@ -76,6 +76,27 @@ tests:
     asserts:
       - notFailedTemplate: {}
 
+  - it: detects if you're using an otlp destination with an invalid protocol
+    set:
+      cluster:
+        name: test-cluster
+      destinations:
+        - name: my-destination
+          type: otlp
+          url: https://otlp.example.com
+          protocol: magic
+    asserts:
+      - failedTemplate:
+          errorMessage: |-
+            execution error at (k8s-monitoring/templates/validations.yaml:5:4): 
+            Destination #0 (my-destination) has an unsupported protocol: magic.
+            The protocol must be either "grpc" or "http"
+            Please set:
+            destinations:
+              - name: my-destination
+                type: otlp
+                protocol: otlp / http
+
   - it: detects if you're using the Grafana Cloud OTLP endpoint with the wrong protocol
     set:
       cluster:

charts/k8s-monitoring/values.schema.json

@@ -1587,7 +1587,11 @@
                     }
                 },
                 "protocol": {
-                    "type": "string"
+                    "type": "string",
+                    "enum": [
+                        "grpc",
+                        "http"
+                    ]
                 },
                 "readBufferSize": {
                     "type": "string"