Jaeger - Distributed tracing system released as open source by Uber
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
Ensighten - Ensighten provides enterprise tag management solutions that enable businesses manage their websites more effectively.
LogTrail - A Kibana plugin to view, search and tail logs and events
Timber.io - Timber.io is the best logging platform for ruby, node, elixir and much more.
Grafana - Data visualization & Monitoring with support for Graphite, InfluxDB, Prometheus, Elasticsearch and many more databases