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Ambari metrics monitor/collector cluster size limitation



I am investigating to have a huge cluster of Nifi instances distributed across the world. I have been told that Metrics Monitor and Metrics Collector are using a very chatty protocol, so Ambari Metrics Collector may face some serious performance issues regarding receiving telemetry information from lots of Metrics Monitor Agents. I have two concerns as follows.

1- How does it scale for thousands of agents?

2- Can I use it over WAN probably by securing that in a two-way SSL way?