[chore] Add config schemas to gcp-related receivers

receiver/googlecloudmonitoringreceiver/config.schema.yaml

@@ -0,0 +1,19 @@
+$defs:
+  metric_config:
+    type: object
+    properties:
+      metric_descriptor_filter:
+        description: Filter for listing metric descriptors. Only support `project` and `metric.type` as filter objects. See https://cloud.google.com/monitoring/api/v3/filters#metric-descriptor-filter for more details.
+        type: string
+      metric_name:
+        type: string
+type: object
+properties:
+  metrics_list:
+    type: array
+    items:
+      $ref: metric_config
+  project_id:
+    type: string
+allOf:
+  - $ref: go.opentelemetry.io/collector/scraper/scraperhelper.controller_config

receiver/googlecloudpubsubpushreceiver/config.schema.yaml

@@ -0,0 +1,9 @@
+description: Config defines configuration for the receiver.
+type: object
+properties:
+  encoding:
+    description: Endpoint identifies the expected encoding of messages received from Pub/Sub.
+    type: string
+    x-customType: go.opentelemetry.io/collector/component.ID
+allOf:
+  - $ref: go.opentelemetry.io/collector/config/confighttp.server_config

receiver/googlecloudpubsubreceiver/config.schema.yaml

@@ -0,0 +1,31 @@
+type: object
+properties:
+  client_id:
+    description: The client id that will be used by Pubsub to make load balancing decisions
+    type: string
+  compression:
+    description: Lock down the compression of the payload, leave empty for attribute based detection
+    type: string
+  encoding:
+    description: Lock down the encoding of the payload, leave empty for attribute based detection
+    type: string
+  endpoint:
+    description: Override of the Pubsub Endpoint, leave empty for the default endpoint
+    type: string
+  ignore_encoding_error:
+    description: Ignore errors when the configured encoder fails to decoding a PubSub messages
+    type: boolean
+  insecure:
+    description: Only has effect if Endpoint is not ""
+    type: boolean
+  project:
+    description: Google Cloud Project ID where the Pubsub client will connect to
+    type: string
+  subscription:
+    description: The fully qualified resource name of the Pubsub subscription
+    type: string
+  user_agent:
+    description: User agent that will be used by the Pubsub client to connect to the service
+    type: string
+allOf:
+  - $ref: go.opentelemetry.io/collector/exporter/exporterhelper.timeout_config

receiver/googlecloudspannerreceiver/config.schema.yaml

@@ -0,0 +1,39 @@
+$defs:
+  instance:
+    type: object
+    properties:
+      databases:
+        type: array
+        items:
+          type: string
+      instance_id:
+        type: string
+  project:
+    type: object
+    properties:
+      instances:
+        type: array
+        items:
+          $ref: instance
+      project_id:
+        type: string
+      service_account_key:
+        type: string
+type: object
+properties:
+  backfill_enabled:
+    type: boolean
+  cardinality_total_limit:
+    type: integer
+  hide_topn_lockstats_rowrangestartkey:
+    type: boolean
+  projects:
+    type: array
+    items:
+      $ref: project
+  top_metrics_query_max_rows:
+    type: integer
+  truncate_text:
+    type: boolean
+allOf:
+  - $ref: go.opentelemetry.io/collector/scraper/scraperhelper.controller_config