Bookstack looks really cool, considering it for a project at work but I don’t like how you can’t have pages outside of books. We’re looking to put together a general knowledge base that could span many different types of equipment and manufactures. For that reason I’m leaning towards wiki.js due to the search and tag browsing, but basically planning on doing the same installing those same 3 to check them out.
Like others said, most likely your HA IP changed, had this happen recently in a power outage. Need to either set them to use hostname or make the HA machine have a static IP.