Missing AWS/NetworkManager CloudWatch metric namespace

[samschmittg1001]

Is your feature request related to a problem? Please describe.
I'm unable to select AWS/NetworkManager as a metadata scrape job due to it being excluded from this library.

Describe the solution you'd like
Add the AWS/NetworkManager namespace to this library

Describe alternatives you've considered
Adding a custom namespace, however that's not supported for metadata scrape jobs

Additional context
Here are the metrics exposed for this namespace: https://docs.aws.amazon.com/network-manager/latest/cloudwan/cloudwan-metrics.html

[njvrzm]

Hi @samschmittg1001 and thanks for the report! I've created a PR to add these metrics. Once that's merged we'll update grafana/grafana and the new metrics will be available once this makes its way through the release process.