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Watchflare: Self-Hosted Server Monitoring

Open-source, self-hosted server monitoring: agents report metrics to the Hub over gRPC/TLS. Learn what the dashboard shows and which platforms are supported.

Watchflare is a self-hosted platform that monitors your hosts and tracks their software. It collects system metrics in real time (CPU, memory, disk, network, and temperatures) and maintains a full package inventory across your fleet: installed versions, daily change history, and available updates.

No cloud dependency. No data leaving your infrastructure.

Two components

Watchflare is made of two pieces that work together:

Hub is the central server. Deploy it once with Docker Compose or as a native Linux binary. It receives data from agents, stores it in a time-series database, and serves the web dashboard. The Hub is a single binary with the frontend embedded.

Agent is a lightweight daemon that runs on each host you want to monitor. It supports Linux and macOS, with Windows support planned. It collects system metrics every 30 seconds, sends a heartbeat every 5 seconds, and builds a daily package inventory. The agent uses minimal resources and runs as an unprivileged system user.

  your-server-1          your-server-2          your-server-3
  [ Agent ]              [ Agent ]              [ Agent ]
      |                      |                      |
      └──────────────────────┴──────────────────────┘
                             |
                         gRPC / TLS 1.3
                             |
                          [ Hub ]
                        dashboard + DB

What it monitors

Category	Metrics
CPU	Usage %, iowait, steal (VMs)
Memory	Used, available, buffers, cached, swap
Disk	Total, used, read/write throughput
Network	Inbound/outbound bandwidth
Temperature	CPU and sensor readings (battery, storage, etc.) on physical hosts
System	Uptime, load average (1/5/15 min), process count
Containers	Per-container CPU, memory, network (Docker/Podman)
Packages	Installed packages, versions, and outdated detection across ~30 supported package managers

What you get

Real-time dashboard. Host status updates within 5 seconds via Server-Sent Events. No polling, no page refresh.
Historical charts. Metrics stored in TimescaleDB with automatic aggregation. View 1h, 12h, 24h, 7d, and 30d time ranges.
Package inventory. Full list of installed packages on every host, updated daily, with change history and outdated package detection.
Alerts. Threshold-based alerts on CPU, memory, disk, load, and temperature, plus host-offline notifications delivered to any of the 26+ services supported by Shoutrrr (Discord, Slack, Telegram, Matrix, Ntfy, Gotify, SMTP, generic HTTP, and more).
Write-Ahead Log. If the Hub is unreachable, the agent buffers metrics locally and replays them on reconnect. Metrics are not lost during brief outages: the WAL holds up to 10 MB by default (configurable via wal_max_size_mb).

Self-hosted, by design

Watchflare runs entirely on your infrastructure. The Hub and its database live on a server you control. Agents communicate only with your Hub: no external services, no telemetry.

Note

Ready to get started? The Quickstart has you up and running in under 5 minutes.