Steps to reproduce:

1. Add a host using AWS RDS instance by HTTP Template. Set the 4 required macros (access keys, region and rds instance id)
2. Navigate to Monitoring -> Hosts -> Select this new host
3. Click on host configuration -> discovery rules

Result:
See screenshot

AWS CloudWatch: Get instance alarms data should be supported but instead it gives error:

Preprocessing failed for: {"error":"Request failed with status code 400: {\"Error\":{\"Code\":\"Throttling\",\"Message\":\"...
1. Failed: TypeError: undefined not callable (property 'forEach' of [object Object])
at [anon] (duktape.c:69012) internal
at [anon] (function:2) preventsyield 

Expected:
This should work!