---
title: Apache Mesos - HTTP Endpoints - /master/observe
layout: documentation
---
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### USAGE ###
>        /master/observe

### TL;DR; ###
Observe a monitor health state for host(s).

### DESCRIPTION ###
This endpoint receives information indicating host(s)
health.
The following fields should be supplied in a POST:
1. monitor - name of the monitor that is being reported
2. hosts - comma separated list of hosts
3. level - OK for healthy, anything else for unhealthy