APM server configuration file

apm-server.yml

# APM server 7.1.1
# run "locate apm-server.yml" to find file's location on server

apm-server:
  # 0.0.0.0 allows the internet to send data to the apm server. 5700 is the port exposed by the apm server
  host: "0.0.0.0:5700"

  # denotes the maximum size of a single event in bytes that can be processed by the APM server.
  # if an event size is greater than the configured then that event is dropped
  max_event_size: 1457600

  # Maximum permitted size in bytes of a request's header accepted by the server to be processed.
  max_header_size: 485760

  # Maximum amount of time to wait for the next incoming request before underlying connection is closed.
  idle_timeout: 90s

  # Maximum permitted duration for reading an entire request.
  read_timeout: 300s

  # Maximum permitted duration for writing a response.
  write_timeout: 300s

  # refers to Real User Monitoring. When enabled the APM server can receive the performance data from the Frontend
  rum:
    enabled: false

# denotes the number of events that can be stored in the APM memory queue.
# If the rate of events becomes higher than the speed with which Elasticsearch can process them then events can 
# be queued. Higher values prevent events to be lost but may take a large amount of RAM during high traffic
queue.mem.events: 20000

# only errors will be logged in the log file
logging.level: error

# enable xpack monitoring for APM (works for APM 7.1.1, for latest version the parameters are different)
xpack.monitoring.enabled: true

# output to which APM server sends the received data
output:
  elasticsearch:
    # the host with port on which ES is running.
    hosts: 127.0.0.1:9200

    # Number of workers per Elasticsearch host.
    # More workers prevents APM queue from filling if ES can keep up with indexing
    worker: 5

    # The maximum number of events to bulk in a single Elasticsearch bulk API index request.
    # The default is 50.
    bulk_max_size: 10000
    
    # Configure http request timeout before failing an request to Elasticsearch.
    timeout: 300