Provide initial telemetry to Azure Application Insights

[tomkerkhove]

Provide initial telemetry to Azure Application Insights. This is to have a operable MVP before starting with #29.

Specification

• Trace validation steps
• Track exceptions in Application Insights
• Track Azure Monitor as dependency
• Provide documentation on what to expect, how to configure, etc.

[tomkerkhove]

In terms of configuration we could:

• Use environment variables as feature flags
• Use a configuration file with all the relevant configuration

For this initial version I would prefer to use environment variables such as:

• PROMITOR_TELEMETRY_DEPENDENCYTRACKING_ENABLED - Enables dependency tracking of Promitor.
  • Default: false
• PROMITOR_TELEMETRY_EXCEPTIONTRACKING_ENABLED - Enables tracking exceptions during processing.
  • Default: true
• PROMITOR_TELEMETRY_TRACING_ENABLED - Enables sending tracing information to Azure Application Insights.
  • Default: true

[tomkerkhove]

Will remove feature flag for exceptions, these should always be logged.

[tomkerkhove]

Initial telemetry is done, dependency info via #847