Topbeat - Email Alerts

Can anyone let me know how can I set email alerts if "fs.free" or my HDD free space is less than 5GB? Also, I would like to get one email per every 30mins, rather getting bulk emails?

You would need to use Logstash for that, Beats doesn't do that natively.

Can u let me know how can i achieve this using logstash ?

Any links or examples ???

I guess Mark is referring to the email output plugin from Logstash: https://www.elastic.co/guide/en/logstash/current/plugins-outputs-email.html.

Thanks Monica. I am looking for something where i can check datetime and trigger these emails every 30mins. How can i perform the current time check in logstash ?