How do make numbers format correctly in Kapacitor messages

Question

Wrote a Kapacitor task that returns an alert message that I can then pipe to other outputs (Sensu, PagerDuty), the problem is that the formatting is not readable.

rabbitmq_memory_usage is CRITICAL: Memory used is too high on 
rabbit@prod-rb-fetcher37 at value: 3.949512928e+08!

Answer 1

Looks like this can be done by passing it to printf

{{ index .Fields "mem_used_mean" | printf "%0.2f" }}