Cloud Monitoring dashboards

Google Cloud Monitoring dashboard definitions for ATE. They turn the raw prometheus.googleapis.com/... metrics that ATE emits into readable per-method latency / throughput / error views.

File	Shows
`ate-grpc-dashboard.json`	ateapi & atelet gRPC latency (p50/p95/p99), request rate, and error rate, by method

Applying

Dashboards are created/updated (idempotently) by setup:

go run ./tools/setup-gcp --create-monitoring-dashboards   # also part of: --all

Or apply any single file by hand:

gcloud monitoring dashboards create --config-from-file=monitoring/dashboards/<file>.json