Migration notes:

• LoggingLevel isn't captured by default as part of Traces' custom dimension because that data is already captured in the SeverityLevel field. For information on how to reenable it, see the config options.
• Exception records are no longer recorded for failed dependencies. They're only recorded for failed requests.

Enhancements:

• Reduce jar file size #2295.
• Stop capturing exception records on dependencies #2307.
• Add support for sampling overrides on http request headers #2308.
• Enable quartz instrumentation by default #2313.
• Add warning message on internal attribute usage #2314.
• Lots of refactoring and improvements.
• Continue to add support for OpenTelemetry metrics API.
• Deprecate logs' LoggingLevel custom property #2254.
• Add support for OpenTelemetry metrics API
• Lots of refactorings and improvements.
• Update OpenTelemetry to 1.15 #2332.
• Add configuration for disk persistence capacity #2329.
• Add support for runtime attach #2325.
• Continue to add support for OpenTelemetry metrics API.