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COSTS.md

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Cost Management & Estimation

Budget Configuration

Setting Value
Monthly Budget 10 EUR (dev) / 50 EUR (prod)
Alert Thresholds 50%, 80%, 100%
Billing Account Configured via GCP Console
Budget ID Managed by Terraform
Scope Single GCP project

Budget alerts are sent to the billing account administrators via email. To add specific notification channels (e.g., Pub/Sub, Slack), configure them in the GCP Console under Billing > Budgets & alerts.

Manual Budget Setup (Console)

If the gcloud budget command fails (permission issues):

  1. Go to GCP Console → Billing → Budgets & alerts
  2. Click Create Budget
  3. Set Name: ai-product-detector-monthly
  4. Scope → Select your project
  5. Amount → Set per environment (10 EUR dev, 50 EUR prod), Budget type: Specified amount
  6. Thresholds → Add rules at 50%, 80%, 100% of actual spend
  7. Under Notifications, add your email via a Monitoring Notification Channel
  8. Click Finish

Cloud Run Configuration

Parameter Value Cost Impact
Max instances 3 Caps parallel compute
Min instances 0 Scale to zero = no idle cost
CPU 1 vCPU Allocated per request
Memory 1 GiB Per container instance
Concurrency 80 (default) Requests per instance
Timeout 300s (default) Max request duration
Startup probe TCP, 240s timeout Allows time for model loading

These values are defined in terraform/environments/prod/main.tf. The dev environment uses smaller defaults (512 Mi memory, max 2 instances).

Cloud Run Pricing (europe-west1)

Resource Price Free Tier (monthly)
CPU $0.00002400/vCPU-second 180,000 vCPU-seconds
Memory $0.00000250/GiB-second 360,000 GiB-seconds
Requests $0.40/million 2 million requests

Free tier translates to:

  • ~50 hours of 1 vCPU compute
  • ~100 hours of 1 GiB memory
  • 2 million requests

Google Cloud Storage (GCS)

Lifecycle Rules (configured)

Rule Condition Action
Temp file cleanup Age > 90 days, prefix tmp/, temp/, cache/ Delete
Old versions cleanup Non-current version > 30 days Delete

GCS Pricing (europe-west1, Standard)

Resource Price Free Tier (monthly)
Storage $0.020/GB/month 5 GB
Class A ops (write) $0.005/1,000 5,000 ops
Class B ops (read) $0.0004/1,000 50,000 ops
Egress (same region) Free -

Estimated usage: < 1 GB DVC data → $0.00 (free tier).

Artifact Registry

Artifact Registry Pricing

Resource Price Free Tier (monthly)
Storage $0.10/GB/month 0.5 GB
Egress (same region) Free -

Estimated usage: ~1-2 GB Docker image → $0.05-0.15/month.

Monthly Cost Estimation

Service Estimated Usage Estimated Cost
Cloud Run Light usage (~100 req/day) $0.00 (free tier)
GCS < 1 GB storage $0.00 (free tier)
Artifact Registry ~1.5 GB (1 image) ~$0.10
Cloud Build (if used) < 120 min/day $0.00 (free tier)
Networking Same-region traffic $0.00
Total estimated < $0.50/month

GCP Free Tier Summary (Always Free)

Service Free Allowance
Cloud Run 2M requests, 180K vCPU-s, 360K GiB-s
Cloud Storage 5 GB Standard, 5K class A ops, 50K class B ops
Cloud Build 120 build-min/day
Artifact Registry 0.5 GB storage
Cloud Logging 50 GB/month
Cloud Monitoring Basic (free)

For a project with light traffic, monthly costs should stay well under the configured budget. The main potential cost driver is Artifact Registry storage if many large images accumulate.

Cost Optimization Applied

  1. Budget alerts with 50%/80%/100% thresholds (10 EUR dev, 50 EUR prod)
  2. Cloud Run scale-to-zero (min-instances=0), max 3 instances
  3. GCS lifecycle auto-deletes temp files (90d) and old versions (30d)
  4. Artifact Registry cleanup: remove unused images periodically

Maintenance Checklist

  • Monthly: Check billing dashboard for unexpected charges
  • Monthly: Clean up unused Artifact Registry images
  • Quarterly: Review Cloud Run scaling settings
  • Review budget alerts if project scope changes