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There’s Splunk

And everything else

ELK stack stuff seems to be the second most common – especially if you have loads of nerds who want to spend acads of time learning, admining, and managing the environment

Beyond that…I’ve yet to run into anything anywhere (outside of tiny envs which may be running something home built, or similar)

Scalyr looks promising…but haven't seen it used anywhere yet

{disclaimer – I'm a Splunk certified consultant}