Does LDK already support production environment (BTC mainnet) use? about ldk-sample HOT 2 OPEN

LDK itself is ready to be used on mainnet, but the ldk-sample project is really just a sample project that is not intended to replace a full node or to be used in a production environment (even though rumor has it some are reckless enough to do so).
So, if you're interested in a full node based on LDK, you may want to have a look at Sensei.

If you're building your own thing based off ldk-sample and you know what you're doing you should easily be able to add a corresponding option. That's coming of course with the usual disclaimer that it's then on you if you're putting your funds at risk.

from ldk-sample.

We should maybe consider enabling mainnet on the sample node, I think. Indeed, its not really intended to be used "seriously" - its just a sample, after all, not a node. Indeed, I do run a mainnet node with a bunch of channels using (a fork of) the ldk-sample here, and it generally works well. We also fix issues with things as they come up, so it mostly is fine.

from ldk-sample.