> ## Documentation Index
> Fetch the complete documentation index at: https://docs.horizonmanaged.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Host & service health

> A real-time operations view of the NEXOS CORE host and its dependencies — metrics, probes, and service control

The Health dashboard is a real-time operations view of the **NEXOS CORE platform
host itself** — the server running your instance. It reports live host metrics
(CPU, memory, disk, network, uptime), lets you define and probe the dependencies
your instance relies on, and lets an operator restart core system services from
the UI.

Open it at `/settings/health`.

<Note>
  This monitors the **NEXOS CORE host**, not your clients' infrastructure. For
  monitoring client endpoints, see [RMM](/rmm/deploy-agent). This is an
  operator/admin tool.
</Note>

## When to use it

* Confirm the host is healthy — CPU/RAM/disk pressure, load average, uptime.
* Check whether key dependencies are reachable (web front end, database, others).
* Diagnose a slowdown — inspect PostgreSQL cache-hit ratio, connections, and slow
  queries.
* Restart a core system service without SSH.

## Host metrics

Live CPU usage and load averages, memory and swap, disk usage, per-interface
network info and aggregate I/O, plus OS, kernel, and uptime.

## Component probes

Define "ecosystem components" and probe them concurrently, each returning a
status and latency. Four check types:

* **HTTP** — a GET with a short timeout (2xx/3xx healthy; auth-style 401/403/405
  still count as "up").
* **TCP** — a port connect.
* **PostgreSQL** — a version check.
* **Process** — `systemctl is-active` (falling back to a process match).

Click a component for extended metrics — for PostgreSQL: database sizes,
connections, cache-hit ratio, and top slow queries (when `pg_stat_statements` is
available); for HTTP: average latency, status, and headers.

## Service management

View and restart a fixed whitelist of core services (e.g. `nexusos-psa`,
`postgresql`, `nginx`, `docker`) directly from the dashboard. Restarts are
audit-logged.

## Good to know

* **Most host metrics are Linux-only** (they read `/proc` and `/etc/os-release`);
  disk also works on macOS.
* Service restart requires systemd with passwordless sudo, and only the
  whitelisted service names are permitted.
* The PostgreSQL probe checks the NEXOS CORE application database.