script to delete all custom metrics from a stackdriver account

delete_custom_metrics.go

package main

import (
	monitoring "cloud.google.com/go/monitoring/apiv3/v2"
	"context"
	"google.golang.org/api/iterator"
	monitoringpb "google.golang.org/genproto/googleapis/monitoring/v3"
	"log"
)

func deleteCustomMetrics(projectID string) {
	ctx := context.Background()
	c, err := monitoring.NewMetricClient(ctx)
	if err != nil {
		log.Fatal(err)
	}

	req := &monitoringpb.ListMetricDescriptorsRequest{
		Name:   "projects/" + projectID,
		Filter: `metric.type = starts_with("custom.googleapis.com")`,
	}
	metricDescriptors := c.ListMetricDescriptors(ctx, req)

	for {
		resp, err := metricDescriptors.Next()
		if err == iterator.Done {
			break
		}
		if err != nil {
			log.Fatal(err)
		}

		deleteReq := &monitoringpb.DeleteMetricDescriptorRequest{
			Name: resp.Name,
		}

		if err := c.DeleteMetricDescriptor(ctx, deleteReq); err != nil {
			log.Fatal(err)
		}
	}
}