Information is a bit scattered but in some ways I think this is a phenomenon that comes with the decentralized project territory a bit. If you think about it IOHK develops the node right now, but the network is no longer run by their servers. In the future it should resemble more a DAO if it evolves along the lines of its vision. Unfortunately this makes information distributed. In this state of flux the only good option is to try to stay connected.
SPO announcements is a good one. There is a listing of official communications channels in this thread which you may already use.
The stake pool best practices workgroup TG is listed in there, which I would suggest to you. Watch the github repo for the node and any tools you rely on such as CNTools or CNCLI which are common, so that you get emails on releases / changes.
Follow IOG / IOHK accounts on twitter, keep eyes on their blog here.
Finally I would suggest you try to get a feel for the SPO community and gradually start developing relationships within it among operators open to communications. I regularly respond to SPO questions in groups or via DM when I have the time to, for instance. There are some very informative pool operator groups out there that have less noise in them than some of the main ones which makes it a little easier to find information.
Lastly about telegram, make thorough use of message searching in these channels as there is a high probability that questions you may have have been asked by someone else before you and you can potentially get an instant answer this way. It is a lot easier than monitoring the current topic and / or asking a question and awaiting responses. Feel free to send me a message if you have more questions, I hope this was at least somewhat helpful.