cpu_alert.tick

stream
    // Select just the cpu_usage_idle measurement from our example database.
    .from().measurement('cpu_usage_idle')
    .alert()
        .crit(lambda: "value" <  70)
        // Whenever we get an alert write it to a file.
        .log('/tmp/alerts.log')

monitor.sh

#!/bin/bash
#
# stack
#  - storage:                       InfluxDB
#  - viz:                           Grafana
#  - cli:                           Glances
#  - systems metrics & aggregation: Telegraf
#  - instrumentation:               statsd client
#  - alerting:                      Kapacitor


install_kapacitor() {
  local version="0.1.1-1"
  local arch="x86_64"
  local url="https://s3.amazonaws.com/influxdb"
  local pkg="kapacitor-${version}.${arch}.rpm"

  wget ${url}/{pkg}
  sudo yum localinstall -y ${pkg}
}

run_alerting() {
  kapacitord config > kapacitor.conf
  # NOTE no entreprise token configured
}

# create the task
kapacitor define \
    -name cpu_alert \
    -type stream \
    -tick ./provisioning/alerts/cpu_alert.tick \
    -dbrp telegraf.default

# test the script
rid=$(kapacitor record stream -name cpu_alert -duration 20s)
kapacitor replay -id $rid -name cpu_alert -tick cpu_alert.tick

# let's go wild
kapacitor enable cpu_alert

while true; do i=0; done