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Sentry.io - From error tracking to performance monitoring, developers can see what actually matters, solve quicker, and learn continuously about their applications - from the frontend to the backend.
GlitchTip - GlitchTip is an open source, Sentry API compatible error tracking platform.
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.
Instabug - The top apps in the world rely on Instabug for beta testing, user engagement and crash reporting.
Graylog - Graylog is an open source log management platform for collecting, indexing, and analyzing both structured and unstructured data.