Ah, this is performance profiling.
Seeing the title and the domain I thought this was user profiling and I was wondering why would Meta be publishing this.
Seeing the title and the domain I thought this was user profiling and I was wondering why would Meta be publishing this.
Perhaps a contributing factor is how HN shows only the final non-eTLD [0] label of the domain. If it showed all labels, you'd have seen "engineering.fb.com" which, while not a dead giveaway, implies that the problem space is technical.
It would be nice if this aggressive truncation were applied only above a certain threshold of length.