IMO ELK is worth it. All the filtering, sorting and graphing means you can easily do post mortems (which makes you more likely to do them at all), you can get d

IMO ELK is worth it. All the filtering, sorting and graphing means you can easily do post mortems (which makes you more likely to do them at all), you can get detailed performance and other metrics without spending days setting up robust testing, and it makes it easy to correlate events from your entire infrastructure. Just make sure NTP is enabled everywhere :) I would budget some time after setting it up to weed out uselessly verbose logging and rotating old logs out of RAM and onto cheap storage. You'll love it.