When running Logstash 5.2 or greater, you can use the monitoring feature in X-Pack to gain deep visibility into metrics about your Logstash deployment. In the overview dashboard, you can see all events received and sent by Logstash, plus info about memory usage and uptime:
Then you can drill down to see stats about a specific node:
A Logstash node is considered unique based on its persistent UUID, which
is written to the
path.data directory when the node
Before you can use the monitoring UI, configure Logstash monitoring.
For information about using the Monitoring UI, see X-Pack monitoring in Kibana.