I am adding a few published Singer taps to my meltano project not in the

discovery.yml

, via the custom plugins feature. Is submitting a MR to add plugins to

discovery.yml

with appropriate documentation encouraged, or is the goal to keep just the existing base taps supported OOTB for now?

Contributing more known taps and targets is definitely encouraged! I had hoped that would be clear from the docs 😄 https://meltano.com/plugins/extractors/:

Don't forget to make your new plugin known to Meltano if you'd like to make it available to other people!

https://meltano.com/docs/command-line-interface.html#how-to-use-custom-plugins:

Once you've succesfully added your custom plugin to your Meltano project, don't forget to make it known to Meltano to make it easier for other people to install in the future!

https://meltano.com/docs/contributor-guide.html#known-plugins:

If you have a plugin you think should also be known to Meltano out of the box, you can contribute a change to that file. All you'll need is the custom plugin definition from your project's

meltano.yml

, which has the same format as known plugin definitions in

discovery.yml

.