Add add_cloud_metadata processor error to exclusion list (#4632)

Author: belimawr

testing/integration/logs_ingestion_test.go

@@ -278,7 +278,8 @@ func testMonitoringLogsAreShipped(
 			"add_cloud_metadata: received error failed requesting openstack metadata: Get \\\"https://169.254.169.254/2009-04-04/meta-data/hostname\\\": dial tcp 169.254.169.254:443: connect: connection refused",                    // okay for the cloud metadata to not work
 			"add_cloud_metadata: received error failed requesting openstack metadata: Get \\\"https://169.254.169.254/2009-04-04/meta-data/placement/availability-zone\\\": dial tcp 169.254.169.254:443: connect: connection refused", // okay for the cloud metadata to not work
 			"add_cloud_metadata: received error failed requesting openstack metadata: Get \\\"https://169.254.169.254/2009-04-04/meta-data/instance-type\\\": dial tcp 169.254.169.254:443: connect: connection refused",               // okay for the cloud metadata to not work
-			"add_cloud_metadata: received error failed with http status code 404", // okay for the cloud metadata to not work
+			"add_cloud_metadata: received error failed with http status code 404",                                                                                                                             // okay for the cloud metadata to not work
+			"add_cloud_metadata: received error failed fetching EC2 Identity Document: not found, Signing",                                                                                                    // okay for the cloud metadata to not work
 			"add_cloud_metadata: received error failed fetching EC2 Identity Document: operation error ec2imds: GetInstanceIdentityDocument, http response error StatusCode: 404, request to EC2 IMDS failed", // okay for the cloud metadata to not work
 			"failed to invoke rollback watcher: failed to start Upgrade Watcher: fork/exec /var/lib/elastic-agent/elastic-agent: no such file or directory",                                                   //on debian this happens probably need to fix.
 		})