Armeria supports metric collection via Micrometer. Micrometer supports wide range of metric collection systems, including Prometheus, Datadog, etc. See https://micrometer.io/ for more information.

Hi! The project lead here. Please feel free to ask questions about Armeria!

Armeria [0] supports pretty much every possible combination of gRPC variants, including gRPC-Web - HTTP/1 and 2, TLS and cleartext, Protobuf and JSON, framed and unframed.

(Disclosure: My team and I wrote it.)

[0] https://line.github.io/armeria