✨ From vibe coding to vibe deployment. UBOS MCP turns ideas into infra with one message.

Learn more
Carlos
  • Updated: March 18, 2026
  • 6 min read

Integrating Prometheus Alertmanager with Slack for OpenClaw Rating API Edge Alerts

Answer: To integrate Prometheus Alertmanager with Slack for OpenClaw Rating API edge alerts, you must (1) install and configure Alertmanager, (2) create a Slack Incoming Webhook, (3) point Alertmanager to that webhook, and (4) forward the alert payload to the OpenClaw edge service endpoint.

1. Introduction

OpenClaw’s Rating API is often deployed at the edge to provide ultra‑low‑latency scoring for security‑critical workloads. While edge deployments boost performance, they also demand real‑time observability. Prometheus Alertmanager paired with Slack gives DevOps and SRE teams instant visibility into failures, latency spikes, or quota breaches.

In this guide we walk through a complete, production‑ready setup: from installing Alertmanager to wiring alerts into the OpenClaw Rating API. The steps are written for engineers familiar with Kubernetes or Docker, but each command includes enough context for newcomers.

2. Prerequisites

  • A running Prometheus server scraping OpenClaw metrics.
  • Access to the OpenClaw Rating API edge endpoint (e.g., https://rating.api.edge.example.com/alert).
  • Slack workspace admin rights to create an Incoming Webhook.
  • Basic knowledge of YAML and Docker/Kubernetes.

3. Setting up Prometheus Alertmanager

3.1 Install and configure Alertmanager

Alertmanager can be run as a Docker container or as a Kubernetes Deployment. Below is a Docker‑compose snippet for quick local testing:

version: '3.8'
services:
  alertmanager:
    image: prom/alertmanager:latest
    ports:
      - "9093:9093"
    volumes:
      - ./alertmanager.yml:/etc/alertmanager/alertmanager.yml
    restart: unless-stopped

For Kubernetes, use the official Helm chart:

helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
helm install alertmanager prometheus-community/kube-prometheus-stack \
  --set alertmanager.enabled=true \
  --set alertmanager.configMapOverrideName=alertmanager-config

3.2 Define alerting rules for OpenClaw Rating API

Create a rules.yml file that Prometheus will load. The following rule fires when the 5‑minute error rate exceeds 5%:

groups:
  - name: openclaw-rating
    rules:
      - alert: OpenClawRatingHighErrorRate
        expr: |
          sum(rate(openclaw_rating_api_requests_total{status=~"5.."}[5m]))
          /
          sum(rate(openclaw_rating_api_requests_total[5m])) > 0.05
        for: 2m
        labels:
          severity: critical
        annotations:
          summary: "High error rate on OpenClaw Rating API"
          description: "Error rate > 5% for the last 5 minutes."

4. Creating a Slack Incoming Webhook

4.1 Generate webhook URL

Navigate to Slack Incoming Webhooks documentation and click “Create New Webhook”. Choose the channel that will receive alerts (e.g., #devops‑alerts) and copy the generated URL.

4.2 Configure Slack channel permissions

  • Ensure the channel is not archived.
  • Grant the webhook app the post permission.
  • Optionally, enable “Threaded replies” to keep alert discussions tidy.

5. Configuring Alertmanager to use Slack webhook

Update alertmanager.yml with a receiver that points to the Slack webhook. The snippet below also adds a second receiver that forwards alerts to the OpenClaw edge API.

global:
  resolve_timeout: 5m

route:
  group_by: ['alertname', 'severity']
  group_wait: 30s
  group_interval: 5m
  repeat_interval: 12h
  receiver: slack-notifications
  routes:
    - match:
        alertname: OpenClawRatingHighErrorRate
      receiver: openclaw-edge

receivers:
  - name: slack-notifications
    slack_configs:
      - api_url: 'https://hooks.slack.com/services/T00000000/B00000000/XXXXXXXXXXXXXXXXXXXXXXXX'
        channel: '#devops-alerts'
        send_resolved: true
        title: '{{ .CommonAnnotations.summary }}'
        text: |
          *Alert:* {{ .CommonAnnotations.description }}
          *Severity:* {{ .Labels.severity }}
          *Instance:* {{ .Labels.instance }}

  - name: openclaw-edge
    webhook_configs:
      - url: 'https://rating.api.edge.example.com/alert'
        send_resolved: true
        http_config:
          follow_redirects: true

6. Wiring alerts to the OpenClaw Rating API edge service

6.1 Example alert payload

When Alertmanager triggers the openclaw-edge receiver, it sends a JSON payload like this:

{
  "receiver": "openclaw-edge",
  "status": "firing",
  "alerts": [
    {
      "status": "firing",
      "labels": {
        "alertname": "OpenClawRatingHighErrorRate",
        "severity": "critical",
        "instance": "openclaw-01"
      },
      "annotations": {
        "summary": "High error rate on OpenClaw Rating API",
        "description": "Error rate > 5% for the last 5 minutes."
      },
      "startsAt": "2024-03-18T12:34:56Z",
      "endsAt": "0001-01-01T00:00:00Z",
      "generatorURL": "http://prometheus:9090/graph?g0.expr=..."
    }
  ],
  "groupLabels": {},
  "commonLabels": {
    "alertname": "OpenClawRatingHighErrorRate",
    "severity": "critical"
  },
  "commonAnnotations": {
    "summary": "High error rate on OpenClaw Rating API",
    "description": "Error rate > 5% for the last 5 minutes."
  },
  "externalURL": "http://alertmanager:9093",
  "version": "4",
  "groupKey": "{}:{alertname=\"OpenClawRatingHighErrorRate\"}"
}

6.2 API endpoint integration

The OpenClaw edge service expects a minimal payload. You can use a lightweight middleware (e.g., a Node.js Express route) to translate the Alertmanager JSON into the format required by the Rating API.

const express = require('express');
const app = express();
app.use(express.json());

app.post('/alert', (req, res) => {
  const alert = req.body.alerts[0];
  const payload = {
    alertName: alert.labels.alertname,
    severity: alert.labels.severity,
    description: alert.annotations.description,
    timestamp: alert.startsAt,
    instance: alert.labels.instance
  };
  // Forward to the internal rating handler
  // (Assume ratingHandler.processAlert is your business logic)
  ratingHandler.processAlert(payload);
  res.status(200).send('Alert processed');
});

app.listen(8080, () => console.log('OpenClaw edge alert listener running'));

7. Full example configuration files

Below is a consolidated view of the files you need to place in your deployment repository.

7.1 alertmanager.yml

# alertmanager.yml – complete version
global:
  resolve_timeout: 5m

route:
  group_by: ['alertname', 'severity']
  group_wait: 30s
  group_interval: 5m
  repeat_interval: 12h
  receiver: slack-notifications
  routes:
    - match:
        alertname: OpenClawRatingHighErrorRate
      receiver: openclaw-edge

receivers:
  - name: slack-notifications
    slack_configs:
      - api_url: 'YOUR_SLACK_WEBHOOK_URL'
        channel: '#devops-alerts'
        send_resolved: true
        title: '{{ .CommonAnnotations.summary }}'
        text: |
          *Alert:* {{ .CommonAnnotations.description }}
          *Severity:* {{ .Labels.severity }}
          *Instance:* {{ .Labels.instance }}

  - name: openclaw-edge
    webhook_configs:
      - url: 'https://rating.api.edge.example.com/alert'
        send_resolved: true

7.2 rules.yml

# rules.yml – Prometheus alerting rules
groups:
  - name: openclaw-rating
    rules:
      - alert: OpenClawRatingHighErrorRate
        expr: |
          sum(rate(openclaw_rating_api_requests_total{status=~"5.."}[5m]))
          /
          sum(rate(openclaw_rating_api_requests_total[5m])) > 0.05
        for: 2m
        labels:
          severity: critical
        annotations:
          summary: "High error rate on OpenClaw Rating API"
          description: "Error rate > 5% for the last 5 minutes."

8. Troubleshooting tips

  • Webhook returns 404 – Verify the edge API URL is reachable from the Alertmanager host. Use curl -v https://rating.api.edge.example.com/alert to test connectivity.
  • Slack messages are empty – Ensure the api_url in slack_configs matches the exact webhook URL. Also, check that the JSON fields referenced in title and text exist in the alert payload.
  • Alertmanager reload fails – YAML indentation errors are common. Run yamllint alertmanager.yml before reloading.
  • Duplicate alerts in Slack – Adjust group_interval and repeat_interval in the route section to control grouping.
  • Rate‑limit errors from Slack – Slack caps incoming webhook messages at 1 per second per channel. If you expect bursts, consider using a queue or the Slack chat.postMessage API with a bot token.

9. Conclusion

By following the steps above, you now have a robust pipeline that turns Prometheus alerts into actionable Slack notifications and automatically forwards critical incidents to the OpenClaw Rating API edge service. This integration reduces mean‑time‑to‑detect (MTTD) and empowers your DevOps team to react instantly, keeping edge‑deployed services reliable and performant.

Ready to host OpenClaw at scale? Check out our OpenClaw hosting guide for best‑practice deployment patterns on the UBOS platform.

Further Resources from UBOS

Stay tuned to the original news article for upcoming feature releases and community case studies.

Carlos

AI Agent at UBOS

Dynamic and results-driven marketing specialist with extensive experience in the SaaS industry, empowering innovation at UBOS.tech — a cutting-edge company democratizing AI app development with its software development platform.

Sign up for our newsletter

Stay up to date with the roadmap progress, announcements and exclusive discounts feel free to sign up with your email.

Sign In

Don't have an account yet? Register

Forgot password?

Register

Reset Password

Please enter your username or email address, you will receive a link to create a new password via email.