README.md

Passenger Input Plugin

Gather Phusion Passenger metrics using the passenger-status command line utility.

Series Cardinality Warning

Depending on your environment, this passenger_process measurement of this plugin can quickly create a high number of series which, when unchecked, can cause high load on your database. You can use the following techniques to manage your series cardinality:

• Use the measurement filtering options to exclude unneeded tags. In some environments, you may wish to use tagexclude to remove the pid and process_group_id tags.
• Write to a database with an appropriate retention policy.
• Limit series cardinality in your database using the max-series-per-database and max-values-per-tag settings.
• Consider using the Time Series Index.
• Monitor your databases series cardinality.

Configuration

# Read metrics of passenger using passenger-status
[[inputs.passenger]]
  ## Path of passenger-status.
  ##
  ## Plugin gather metric via parsing XML output of passenger-status
  ## More information about the tool:
  ##   https://www.phusionpassenger.com/library/admin/apache/overall_status_report.html
  ##
  ## If no path is specified, then the plugin simply execute passenger-status
  ## hopefully it can be found in your PATH
  command = "passenger-status -v --show=xml"

Permissions:

Telegraf must have permission to execute the passenger-status command. On most systems, Telegraf runs as the telegraf user.

Metrics:

• passenger

  • tags:
    • passenger_version
  • fields:
    • process_count
    • max
    • capacity_used
    • get_wait_list_size

• passenger_supergroup

  • tags:
    • name
  • fields:
    • get_wait_list_size
    • capacity_used

• passenger_group

  • tags:
    • name
    • app_root
    • app_type
  • fields:
    • get_wait_list_size
    • capacity_used
    • processes_being_spawned

• passenger_process

  • tags:
    • group_name
    • app_root
    • supergroup_name
    • pid
    • code_revision
    • life_status
    • process_group_id
  • fields:
    • concurrency
    • sessions
    • busyness
    • processed
    • spawner_creation_time
    • spawn_start_time
    • spawn_end_time
    • last_used
    • uptime
    • cpu
    • rss
    • pss
    • private_dirty
    • swap
    • real_memory
    • vmsize

Example Output:

passenger,passenger_version=5.0.17 capacity_used=23i,get_wait_list_size=0i,max=23i,process_count=23i 1452984112799414257
passenger_supergroup,name=/var/app/current/public capacity_used=23i,get_wait_list_size=0i 1452984112799496977
passenger_group,app_root=/var/app/current,app_type=rack,name=/var/app/current/public capacity_used=23i,get_wait_list_size=0i,processes_being_spawned=0i 1452984112799527021
passenger_process,app_root=/var/app/current,code_revision=899ac7f,group_name=/var/app/current/public,life_status=ALIVE,pid=11553,process_group_id=13608,supergroup_name=/var/app/current/public busyness=0i,concurrency=1i,cpu=58i,last_used=1452747071764940i,private_dirty=314900i,processed=951i,pss=319391i,real_memory=314900i,rss=418548i,sessions=0i,spawn_end_time=1452746845013365i,spawn_start_time=1452746844946982i,spawner_creation_time=1452746835922747i,swap=0i,uptime=226i,vmsize=1563580i 1452984112799571490
passenger_process,app_root=/var/app/current,code_revision=899ac7f,group_name=/var/app/current/public,life_status=ALIVE,pid=11563,process_group_id=13608,supergroup_name=/var/app/current/public busyness=2147483647i,concurrency=1i,cpu=47i,last_used=1452747071709179i,private_dirty=309240i,processed=756i,pss=314036i,real_memory=309240i,rss=418296i,sessions=1i,spawn_end_time=1452746845172460i,spawn_start_time=1452746845136882i,spawner_creation_time=1452746835922747i,swap=0i,uptime=226i,vmsize=1563608i 1452984112799638581