10 years' stelar work down the loo
“Kristian Fiskerstrand has done a stellar job maintaining the pool for more than ten years, but ..."
It seems that, for whatever reason, he's really not up to the task anymore.
It's quite obviously his prerogative to stay or leave if he does not want to continue doing what he has done quite well up to now.
He's absolutely under no obligation to keep doing it.
But to leave the helm unmanned without someone to replace him or at the very least send notice to those that depend on his being there is as irresponsible as it can possibly get: kind of flushes ten years of stellar work down the loo.
Clearly more than enough reason to look for a suitable replacement.