Feature/lab8

app/Dockerfile

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+FROM golang:1.24.5-alpine AS builder
+
+WORKDIR /src
+
+COPY go.mod ./
+RUN go mod download
+
+COPY . .
+
+RUN CGO_ENABLED=0 go build \
+    -trimpath \
+    -ldflags="-s -w" \
+    -o /quicknotes
+
+FROM gcr.io/distroless/static:nonroot
+
+COPY --from=builder /quicknotes /quicknotes
+COPY --from=builder /src/seed.json /seed.json
+
+EXPOSE 8080
+
+USER 65532:65532
+
+ENTRYPOINT ["/quicknotes"]

compose.yaml

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+services:
+  quicknotes:
+    image: quicknotes:lab6
+    build:
+      context: ./app
+    user: "0:0"
+
+    ports:
+      - "8080:8080"
+
+    environment:
+      ADDR: ":8080"
+      DATA_PATH: "/data/notes.json"
+      SEED_PATH: "/seed.json"
+
+    volumes:
+      - quicknotes-data:/data
+
+    restart: unless-stopped
+
+
+  prometheus:
+    image: prom/prometheus:v3.3.1
+
+    ports:
+      - "9090:9090"
+
+    volumes:
+      - ./monitoring/prometheus/prometheus.yml:/etc/prometheus/prometheus.yml:ro
+
+    depends_on:
+      - quicknotes
+  grafana:
+    image: grafana/grafana:11.6.16
+
+    ports:
+      - "3000:3000"
+
+    environment:
+      GF_SECURITY_ADMIN_USER: admin
+      GF_SECURITY_ADMIN_PASSWORD: supersecret123
+
+    volumes:
+      - ./monitoring/grafana/provisioning:/etc/grafana/provisioning
+      - ./monitoring/grafana/dashboards:/var/lib/grafana/dashboards
+
+    depends_on:
+      - prometheus
+
+volumes:
+  quicknotes-data:

docs/runbook/high-error-rate.md

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+# High Error Rate Alert
+
+## What this alert means
+More than 5% of requests to QuickNotes are failing with HTTP 4xx or 5xx statuses over the last 5 minutes.
+
+## Triage steps
+1. Check the Grafana dashboard → Errors panel to confirm the error ratio and see which endpoints are affected.
+2. Look at the QuickNotes logs (`docker logs quicknotes`) for stack traces or specific error messages.
+3. Verify the health of dependent services (database, external APIs) by checking their connectivity and response times.
+
+## Mitigations
+- **Rollback** the latest deployment if a code change was recently pushed (revert to the previous image tag).
+- **Increase logging** and enable debug mode to capture more details, then restart the service to clear any transient state.
+
+## Post-incident
+After resolving, create a postmortem following the [template](https://github.com/your-repo/docs/postmortem-template.md) to document the root cause, impact, and action items.

monitoring/grafana/provisioning/dashboards/dashboard.yml

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+apiVersion: 1
+
+providers:
+  - name: default
+    folder: ""
+    type: file
+
+    options:
+      path: /var/lib/grafana/dashboards

monitoring/grafana/provisioning/datasources/datasource.yml

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+apiVersion: 1
+
+datasources:
+  - name: Prometheus
+    type: prometheus
+    access: proxy
+    url: http://prometheus:9090
+    isDefault: true

monitoring/prometheus/prometheus.yml

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+global:
+  scrape_interval: 15s
+
+scrape_configs:
+  - job_name: quicknotes
+
+    static_configs:
+      - targets:
+          - quicknotes:8080