pagerduty-icinga2.conf

object User "pagerduty" {
  pager = "SERVICE_KEY_HERE"
  groups = [ "icingaadmins" ]
  display_name = "PagerDuty Notification User"
  states = [ OK, Warning, Critical, Unknown ]
  types = [ Problem, Recovery ]
}

object NotificationCommand "notify-service-by-pagerduty" {
  import "plugin-notification-command"
  command = "/usr/share/pdagent-integrations/bin/pd-nagios -i \"event_source=service;host_name=$host.name$;service_desc=$service.name$\" -n service -k $user.pager$ -t $notification.type$ -f SERVICEDESC=$service.name$ -f SERVICESTATE=$service.state$ -f HOSTNAME=$host.name$ -f SERVICEOUTPUT=$s$"
}

object NotificationCommand "notify-host-by-pagerduty" {
  import "plugin-notification-command"
  command = "/usr/share/pdagent-integrations/bin/pd-nagios -i \"event_source=host;host_name=$host.name$\" -n host -k $user.pager$ -t $notification.type$ -f HOSTNAME=$host.name$ -f HOSTSTATE=$host.state$ -f HOSTOUTPUT=$host.output$"
}

apply Notification "pagerduty-service" to Service {
  command = "notify-service-by-pagerduty"
  states = [ OK, Warning, Critical, Unknown ]
  types = [ Problem, Acknowledgement, Recovery ]
  period = "24x7"
  users = [ "pagerduty" ]

  assign where service.vars.enable_pagerduty == true
}

apply Notification "pagerduty-host" to Host {
  command = "notify-host-by-pagerduty"
  states = [ Up, Down ]
  types = [ Problem, Acknowledgement, Recovery ]
  period = "24x7"
  users = [ "pagerduty" ]

  assign where host.vars.enable_pagerduty == true
}

Added missing trailing " end quote to notify-service-bypagerduty command string.