CPU Alert TICK script

cpu_alert.tick

stream
    // Select just the cpu measurement from our example database.
    |from()
        .measurement('cpu')
    |alert()
        .message('{{ .Level }}: CPU idle usage is above 80% threshold @ {{ index .Tags "host" }}')
        .crit(lambda: "usage_idle" >  80)
        // Whenever we get an alert write it to a file.
        .log('/var/log/alerts.log')
        
        // And send a notification to Slack
        .slack()
        .channel('#influx-alerts')