Heartbeat

Heartbeat is a lightweight shipper that monitors server uptime. It can be installed on a remote server; after that, it periodically checks the status of different services and tell us whether they're available. The major difference between Metricbeat and Heartbeat is that Metricbeat tells us whether that server is up or down, while Heartbeat tells us whether services are reachable—it's quite similar to the ping command, which tells us whether the server is responding.