I used to use Logentries for a while. It's essentially a hosted ELK. I think they got bought-out or something, and the service went downhill. Don't remember exa

I used to use Logentries for a while. It's essentially a hosted ELK. I think they got bought-out or something, and the service went downhill. Don't remember exactly, but it was slow and clunky, and support wasn't great either. Then discovered Scalyr. It was awesome. The UI isn't pretty, but it's super-powerful. It's fast. You have to format your logs to make the most of it, but it's worth it. Unfortunately their alerting wasn't as flexible at the time (for example, it wouldn't include contextual info from the matching logs that triggered the alert). Besides that, we decided to consolidate things and move to Datadog. Datadog is pretty great. The monitoring and alerting features are solid. They then added logging, APM and keep adding more. It's not that cheap, but overall works great for us.