---
title: "Update viewer heartbeat"
method: POST
path: "/metrics/heartbeat"
tags: ["Host Metrics"]
---

# Update viewer heartbeat

`POST /metrics/heartbeat`

Updates the heartbeat timestamp for a metrics viewer session to keep it alive.

## Request body

- object
  - `viewerSessionId` string

## Response `200`

Heartbeat updated successfully.

## Other responses

- `400` — Invalid viewerSessionId.
- `401` — Session expired - please log in again.
- `404` — Viewer session not found.
- `500` — Failed to update heartbeat.

---

[API](https://skmtc.dev/termix/apis/termix-api.md) · [All operations](https://skmtc.dev/termix/apis/termix-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/termix/termix-api/revisions/f4ef343eff1b/schema)