Packetbeat captures the network traffic between applications and servers. It is a packet analyzer that works in real-time. It does tasks such as decoding the application layer protocols, namely HTTP, MySQL, Memcache, and Redis. It also correlates the requests to responses and records the different transaction fields that may interest you. Packetbeat is used to sniff the traffic between different servers and parses the application-level protocol; it also converts messages into transactions. It also notices issues with the backend application, such as bugs or other performance-related problems, and so it makes troubleshooting tasks easy. Packetbeat can run on the same server which contains application processes, or on its own servers. Packetbeat ships the collected transaction details to the configured output, such as Elasticsearch, Logstash, Redis, or Kafka.