Do everything in your power to find out what's actually happening with a bug; don't just guess. - SQL - Your metrics system's query language - jq - sort / u

Do everything in your power to find out what's actually happening with a bug; don't just guess. - SQL - Your metrics system's query language - jq - sort / uniq - grep - awk - pyplot - mapbox (if you have geospatial data) - your environment's canonical profiler, and how to connect it in situ - how to poke the relevant APIs with your bare hands (curl, grpcurl, etc) - how to MITM and inspect the communications between your components (wireshark, charles, certificate trust stores, feature flags to disable pinning, etc)