The current version of SAM creates Prometheus metric endpoints which appear to be handled correctly by the current prometheus scraper, however the metrics do not confirm to the current prometheus standard.  The standard states: 

• Prometheus' text-based format is line oriented. Lines are separated by a line feed character (\n). The last line must end with a line feed character. Empty lines are ignored.

Link is here: Prometheus format

In the current output on the

<hostname>:8080/api/monitor/metrics

I installed a community version of Intersystems IRIS in a Large AWS EC2 instance to do some testing.  I installed SAM and when I try to "Add a new cluster" I receive the following:  "ERROR #5005: Cannot open file '/config/prometheus/isc_tmp_yml_file.yml'"
Screen shot included here: https://share.getcloudapp.com/RBu4K5yv