monitoring: migrate to microgen

Evaluation diff: https://code-review.googlesource.com/c/gocloud/+/51192

Change-Id: I18878615440c917d32b73c7ae0add6974ee79d42
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/51193
Reviewed-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Chris Cotter <cjcotter@google.com>
Reviewed-by: Tyler Bui-Palsulich <tbp@google.com>
diff --git a/internal/gapicgen/generator/config.go b/internal/gapicgen/generator/config.go
index fbe6a3b..822e65b 100644
--- a/internal/gapicgen/generator/config.go
+++ b/internal/gapicgen/generator/config.go
@@ -514,6 +514,14 @@
 		apiServiceConfigPath:  "google/cloud/asset/v1p2beta1/cloudasset_v1p2beta1.yaml",
 		releaseLevel:          "beta",
 	},
+	{
+		inputDirectoryPath:    "google/monitoring/v3",
+		pkg:                   "monitoring",
+		importPath:            "cloud.google.com/go/monitoring/apiv3",
+		gRPCServiceConfigPath: "google/monitoring/v3/monitoring_grpc_service_config.json",
+		apiServiceConfigPath:  "google/monitoring/v3/monitoring.yaml",
+		releaseLevel:          "alpha",
+	},
 }
 
 // Relative to gocloud dir.
@@ -535,6 +543,5 @@
 	"google/cloud/talent/artman_talent_v4beta1.yaml",
 	"google/cloud/vision/artman_vision_v1p1beta1.yaml",
 	"google/logging/artman_logging.yaml",
-	"google/monitoring/artman_monitoring.yaml",
 	"google/pubsub/artman_pubsub.yaml",
 }