Sensu::Extensions::CheckDependencies
This filter extension provides the Sensu Core built-in filter check_dependencies.
This filter matches events when an event already exists, enabling the user to
reduce notification noise and only be notified for the “root cause” of a given
failure. Check dependencies can be defined in the check definition, using
dependencies, an array of checks (e.g. check_app), Sensu client/check pairs
(e.g. db-01/check_mysql), or a subscription/check pair
(e.g. subscription:mysql/check_mysql).
Installation
This extension requires Sensu version >= 0.26 and is provided as a built-in filter in Sensu >= 0.29.
To manually install this extension on a Sensu server machine:
$ sudo sensu-install -e check-dependencies:1.1.0
Edit /etc/sensu/conf.d/extensions.json to load it:
{
"extensions": {
"check-dependencies": {
"version": "1.1.0"
}
}
}
Example Check/Handler Configuration
Specify a dependency on the mysql check:
{
"checks": {
"web_application_api": {
"command": "check-http.rb -u https://localhost:8080/api/v1/health",
"subscribers": [
"web_application"
],
"interval": 20,
"dependencies": [
"mysql"
]
}
}
}... or specify a dependency on another client's mysql check:
{
"checks": {
"web_application_api": {
"command": "check-http.rb -u https://localhost:8080/api/v1/health",
"subscribers": [
"web_application"
],
"interval": 20,
"dependencies": [
"db-01/mysql"
]
}
}
}... or specify a dependency on any mysql check in the mysql_nodes
subscription:
{
"checks": {
"web_application_api": {
"command": "check-http.rb -u https://localhost:8080/api/v1/health",
"subscribers": [
"web_application"
],
"interval": 20,
"dependencies": [
"subscription:mysql_nodes/mysql"
]
}
}
}Apply the check_dependencies filter to one or more handlers:
{
"handlers": {
"custom_mailer": {
"type": "pipe",
"command": "custom_mailer.rb",
"filters": ["check_dependencies"]
}
}
}