Logging: Quickly search, filter, and analyze your logs for troubleshooting and open-ended exploration of your data. Explore and analyze logs from all your services, applications, and platforms. Search and filter your logs using automatically generated facets. Visualize log data on dashboards or build sophisticated alerts. DataDog is super capable and enterprise scale, but on the more expensive end.
APM: Monitor, troubleshoot, and optimize end-to-end application performance.