handlers_pagerduty.json

{
  "handlers": {
    "pagerduty": {
      "type": "pipe",
      "mutator": "preserve_pagerduty_alert",
      "severities": [
        "critical",
        "ok"
      ],
    }
  }
}

mutators_preserve_pagerduty_alert.json

{
  "mutators": {
    "preserve_pagerduty_alert": {
      "command": "/etc/sensu/mutators/preserve_pagerduty_alert.rb"
    }
  }
}

preserve_pagerduty_alert.rb

#!/usr/bin/env ruby

require 'rubygems'
require 'json'

# Read event data
event = JSON.parse(STDIN.read)

# Modify event action so that certain check alerts do not get resolved automatically via API
if event['action'] == 'resolve' && event['check']['no_auto_resolve'] == true
  event['action'] = 'do_not_resolve'
  event.merge!('mutated' => true, 'why_mutated' => "Do not resolve alerts!!")
end

# Output mutated event data to STDOUT for handler to play with
puts event.to_json