Alertmanager vs Karma
A side-by-side comparison of two self-hosted monitoring & status options — licensing, setup difficulty, resource needs, and what each one replaces.
| Feature | Alertmanager | Karma |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 92 · Excellent | 87 · Excellent |
| Category | Monitoring & Status | Monitoring & Status |
| License | Apache-2.0 | Apache-2.0 |
| Language | Go | TypeScript |
| Setup difficulty | Medium | Easy |
| Min. RAM | 64 MB | 64 MB |
| Deployment | docker, kubernetes, binary | docker, binary |
| GitHub stars | ★ 8,626 | ★ 2,680 |
| First released | 2015 | 2017 |
| Replaces | PagerDuty, Opsgenie | PagerDuty |
What are Alertmanager and Karma?
Alertmanager
Alertmanager handles alerts sent by Prometheus and other clients, taking care of deduplication, grouping, and routing to receivers such as email, Slack, or PagerDuty. It also supports silences and inhibition rules.
- Alert deduplication and grouping
- Flexible routing trees
- Silences and inhibition
- Many notification integrations
Karma
Karma is a web dashboard that aggregates and displays alerts from one or more Alertmanager instances. It provides grouping, filtering, and silencing in a single clean view for on-call engineers.
- Multi-Alertmanager aggregation
- Alert grouping and filtering
- Inline silence management
- Auto-refreshing display
Alertmanager vs Karma: key differences
Alertmanager is written in Go, while Karma is built with TypeScript. Alertmanager is the more established project (first released 2015), while Karma arrived in 2017. Alertmanager has the considerably larger community, at 8,626 GitHub stars versus 2,680.
Why pick each one
Choose Alertmanager if…
- Powerful routing logic
- Standard in the Prometheus stack
Watch out for
- YAML config can get complex
- Tied to Prometheus ecosystem
Choose Karma if…
- Clear at-a-glance overview
- Lightweight
Watch out for
- Read-mostly view
- Requires Alertmanager
Frequently asked questions
Is Alertmanager or Karma better?
Neither is universally better. Alertmanager has the larger community, while Karma is simpler to set up (easy difficulty). Choose based on the comparison table above and your own setup.
Are Alertmanager and Karma free and open-source?
Yes. Alertmanager is licensed under Apache-2.0 and Karma under Apache-2.0. Both can be self-hosted at no software cost.
Can I run Alertmanager and Karma with Docker?
Alertmanager: yes. Karma: yes.