feat: Add instrumentation for In-Process Azure Functions

[tippmar-nr]

Description

• Adds instrumentation for In-Process (Windows only, .NET 6 or .NET 8) Azure Functions
• Adds Distributed Tracing support for In-Process Azure Functions for the following cases:
  • HttpTrigger functions will read incoming distributed trace headers if the trigger method has a parameter of type System.Net.Http.HttpRequest, Microsoft.AspNetCore.Http.DefaultHttpRequest or Microsoft.AspNetCore.Http.HttpRequest.
  • ServiceBusTrigger functions will read incoming distributed trace headers if the trigger method has a parameter of type Azure.Messaging.ServiceBus.ServiceBusReceivedMessage. Trace headers are expected to be in the ApplicationProperties collection.
  • Distributed trace headers will be inserted into the ApplicationProperties collection for Triggers with return a type of Azure.Messaging.ServiceBus.ServiceBusMessage.
• Adds two new supportability metrics for Azure Functions:
  • Supportability/DotNet/AzureFunction/Worker/InProcess (or /Isolated)
  • Supportability/DotNet/AzureFunction/Trigger/{TriggerType} where {TriggerType} is the name of the trigger attribute (minus the TriggerAttribute suffix).
• Existing Supportability/DotNet/AzureFunctionMode/Enabled metric has been replaced with Supportability/DotNet/AzureFunctionMode/enabled and Supportability/DotNet/AzureFunctionMode/disabled.

Includes integration tests.

Author Checklist

• Unit tests, Integration tests, and Unbounded tests completed
• Performance testing completed with satisfactory results (if required)

Reviewer Checklist

• Perform code review
• Pull request was adequately tested (new/existing tests, performance tests)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 95.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.17%. Comparing base (7ab30d7) to head (7fdbf7b).

Files with missing lines	Patch %	Lines
...nt/NewRelic/Agent/Core/Transactions/Transaction.cs	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3003      +/-   ##
==========================================
+ Coverage   82.11%   82.17%   +0.06%     
==========================================
  Files         476      476              
  Lines       30536    30553      +17     
  Branches     3416     3418       +2     
==========================================
+ Hits        25075    25108      +33     
+ Misses       4661     4644      -17     
- Partials      800      801       +1     

Flag	Coverage Δ
Agent	83.23% <90.00%> (+0.06%)	⬆️
Profiler	72.49% <100.00%> (+0.09%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...elic/Agent/Core/AgentHealth/AgentHealthReporter.cs	89.23% <100.00%> (+0.66%)	⬆️
...c/Agent/NewRelic/Agent/Core/Metrics/MetricNames.cs	92.51% <100.00%> (+0.05%)	⬆️
...nt/NewRelic/Profiler/Configuration/Configuration.h	71.26% <100.00%> (+0.86%)	⬆️
...nt/NewRelic/Agent/Core/Transactions/Transaction.cs	80.70% <75.00%> (-0.03%)	⬇️

... and 5 files with indirect coverage changes

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