Monitoring is a vital part of keeping any infrastructure running. Mesos integrates well with existing monitoring solutions and has plugins for most of the monitoring solutions, including Nagios, collectd (https://github.com/rayrod2030/collectd-mesos), and so on. This allows Mesos to leverage all the years of experience that operators have with these tools. The installation procedure of these plugins is completely dependent on the tool and is similar to any other plugin installation that does not require any knowledge of Mesos. The HTTP endpoint also gives the monitoring information. http://<master>/metrics/snapshot spits out a detailed resource report similar to the following code snippet:
{
"master/cpus_percent":0,
"master/cpus_total":2,
"master/cpus_used":0,
"master/disk_percent":0,
"master/disk_total":32808,
...
"registrar/queued_operations":0,
"registrar/registry_size_bytes":405,
"registrar/state_fetch_ms":8.523776,
"registrar/state_store_ms...