Series
Watchman
3 posts in this series, newest first.
Systems28 Jul 20263 min readWatchman
Watchman: cutting the p99 with a second index
A rule evaluator that was fast on average and terrible at the tail, and the boring index that fixed it.
Interface19 May 20264 min readWatchman
Watchman: alert fatigue and the quiet hours rule
The best feature I shipped to Watchman this year was one that sends fewer notifications.
Systems4 Mar 20266 min readWatchman
Watchman: ingest at forty thousand events a second
How Watchman's event pipeline went from choking at 3k/s to holding 40k/s on a single writer, and the three ideas that got it there.