Cost Management Rules — propane-will-491900-m5

Hard rules

Billing budget alert must be created BEFORE any resource deployment. Alert thresholds: 50% / 75% / 90% / 100% of monthly budget. Start with 5 USD (~55 NOK) for dev/test phases.
Agent Runtimes cost money when deployed — always undeploy via 03-teardown.sh at end of workday.
Vertex AI Endpoints — same rule as above.
Staging bucket lifecycle: auto-delete objects older than 7 days.
Colab Enterprise runtimes — terminate when not actively developing.
GCP does NOT enforce a hard spend cap. Budget alerts are email-only by default.

Agent Runtime pricing (May 2026)

Resource	Free Tier/month	Paid rate
vCPU	180,000 vCPU-seconds	~$0.0864/vCPU-hour
RAM	360,000 GiB-seconds	~$0.0090/GiB-hour

Agent Runtime does NOT bill for idle/non-running agents (pay-per-use). Always delete at end of session.

NEW billing lines (effective Jan 28, 2026)

These were previously free/in preview and are now METERED:

Sessions — agent interaction contexts
Memory Bank — long-term memory storage
Code Execution — sandboxed code runs

→ Trim session histories. Only persist high-value facts to Memory Bank. Disable Code Execution on agents that don't need it.

Cloud Run cost profile

--min-instances=0 → scales to zero — no idle cost (use for dev/test)
--min-instances=1 → keeps one warm instance — eliminates cold-start (~$4–8/month)
Cleanup: gcloud run services delete SERVICE_NAME --region=us-central1 --quiet

Lifecycle JSON for staging bucket

{
  "rule": [
    {
      "action": { "type": "Delete" },
      "condition": { "age": 7 }
    }
  ]
}

gcloud storage buckets update gs://propane-will-491900-m5-agent-staging \
  --lifecycle-file=lifecycle.json

RAG Engine cost warning

If RAG Engine uses a managed Spanner instance as vector DB → billed 24/7.
For dev/test: prefer us-east1 or us-east4 until us-central1 allowlist is granted.
Contact: vertex-ai-rag-engine-support@google.com for us-central1 allowlist access.

Artifact Registry cleanup

gcloud artifacts docker images list \
  us-central1-docker.pkg.dev/propane-will-491900-m5/oavauco-docker \
  --format="value(IMAGE,DIGEST)" | tail -n +2 | \
  while read -r image digest; do
    gcloud artifacts docker images delete "${image}@${digest}" --quiet
  done

Pub/Sub hard-stop billing automation (optional)

Consider: Pub/Sub → Cloud Run Function to auto-disable billing if budget alert fires. Template: https://cloud.google.com/billing/docs/how-to/notify#cap_disable_billing_to_stop_usage

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