What is p1, p2?

This read like a conversation you were having in your head -- unfiltered.

Very commonly used acronyms in business/SWE contexts.

The lower the number the higher the priority, e.g. if production is broken someone might say "This is p -1" (higher than your highest priority).

P0 is "do this immediately", P1 is very important, P2/P3 are like "nice to haves." P100 would mean something like "we will never do this"

Same understanding as you.

At 3am,

P0 = get people out of bed and fix this now.

P1 = we can fix this in the morning.

P2 = we can fix this before CoB today.

P3 = push it into the current sprint.

P4 = put it in backlog.

priority 1,2 etc, more like severity of the cases

It’s a very common abbreviation; i had no issue understanding GPs post tbh