Application Insights

AI - features

already a solid and widely-used solution for performance management and tracking data
cross-platform(.NET, NodeJS, J2EE)
requires only a small package to work
possibility to pull the data from PCs, Azure diagnostic, Docker logs etc.
tracks dependencies(storage, services...) out of the box
gathered data is available in the portal and queryable
integrates with VS and PowerBI

available by logging custom events/traces
it's possible to add custom string/numeric properties so it is possible to filter the data
custom telemetry initializers give a possibility to e.g. perform A | B testing
user data is correlated thanks to a unique correlation identifier
it's possible to perform a constant export to a blob storage(charged additionally when used with a Basic tier). It's stored as JSON files so it is possible to perform further analysis with it

Data is stored only for 90 days - if one needs it for a longer period, continuous export should be used
For a Basic tier - it's free with a 1GB limit of data per month, for an Enterprise tier it's 12,65 EUR per node for 200MB
For simpler scenarios is good as it is, when faced against a more complex one, it usually requires some work to code stuff
Throttling limits the data rate to 32 k events per second, averaged over 1 minute. The maximum cap is 500 GB/day