I have never had an LED light bulb fail. I'm still using the same 6-pack I bought over a decade ago, bringing them with me from apartment to apartment. I only have 5 remaining because the glue that holds the glass bulb onto the base eventually failed on one and I couldn't be bothered to figure out what the correct adhesive would be for lightbulbs.
Fair enough but they don't get hot, nearly any glue would work, Being plastic, I would use CA(superglue).
After failure I like to do a postmortem teardown, it has never been the LED proper, usually it is the capacitor in a capacitance power supply, otherwise the controller IC.