Add GMP changelog, mark gmp mutating, update go.mod

.chloggen/gcp-0482.yaml

@@ -7,7 +7,7 @@ change_type: enhancement
 component: googlecloudexporter
 
 # A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
-note: Google Cloud and GMP exporters are marked as mutating.
+note: Google Cloud exporter is marked as mutating.
 
 # Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
 issues: [35366]

.chloggen/gmp-0482.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: googlemanagedprometheusexporter
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: GMP exporter is marked as mutating.
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [35366]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: []

exporter/googlemanagedprometheusexporter/factory.go

@@ -12,6 +12,7 @@ import (
 	"github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/collector"
 	"github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/collector/googlemanagedprometheus"
 	"go.opentelemetry.io/collector/component"
+	"go.opentelemetry.io/collector/consumer"
 	"go.opentelemetry.io/collector/exporter"
 	"go.opentelemetry.io/collector/exporter/exporterhelper"
 
@@ -64,5 +65,7 @@ func createMetricsExporter(
 		// Disable exporterhelper Timeout, since we are using a custom mechanism
 		// within exporter itself
 		exporterhelper.WithTimeout(exporterhelper.TimeoutConfig{Timeout: 0}),
-		exporterhelper.WithQueue(eCfg.QueueSettings))
+		exporterhelper.WithQueue(eCfg.QueueSettings),
+		exporterhelper.WithCapabilities(consumer.Capabilities{MutatesData: true}),
+	)
 }