Adding sdk tracing capabilities on spring

[salaboy]

Description

Adding Spring Boot tracing capabilities using Observation API from micrometer. This adds support for not using auto instrumentation.

Issue reference

We strive to have all PR being opened based on an issue, where the problem or feature have been discussed prior to implementation.

Please reference the issue this PR will close: #[issue number]

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Extended the documentation

[codecov]

Codecov Report

❌ Patch coverage is 20.00000% with 656 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.95%. Comparing base (14c41cf) to head (cbb117c).

Files with missing lines	Patch %	Lines
...t4/autoconfigure/client/ObservationDaprClient.java	0.00%	286 Missing ⚠️
...ot/autoconfigure/client/ObservationDaprClient.java	31.46%	196 Missing ⚠️
...onfigure/client/ObservationDaprWorkflowClient.java	0.00%	116 Missing ⚠️
...onfigure/client/ObservationDaprWorkflowClient.java	53.44%	53 Missing and 1 partial ⚠️
...nfigure/client/DaprClientSB4AutoConfiguration.java	50.00%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1713      +/-   ##
============================================
- Coverage     79.54%   72.95%   -6.60%     
- Complexity     2196     2253      +57     
============================================
  Files           238      242       +4     
  Lines          6591     7409     +818     
  Branches        732      738       +6     
============================================
+ Hits           5243     5405     +162     
- Misses          990     1643     +653     
- Partials        358      361       +3     

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[Copilot]

Pull request overview

This PR adds Spring Boot tracing capabilities using the Micrometer Observation API. It provides transparent observation/span creation for Dapr client operations without requiring changes to consumer code. The implementation includes decorator wrappers for both DaprClient and DaprWorkflowClient that create named Micrometer observations for each non-deprecated method call, making traces available to OpenTelemetry and other observability backends.

Changes:

• New ObservationDaprClient and ObservationDaprWorkflowClient decorator classes that wrap client calls with Micrometer observations
• Updated auto-configuration to conditionally wrap clients when a non-noop ObservationRegistry is available
• Comprehensive test coverage for the new observation wrappers and auto-configuration behavior
• Added micrometer-observation dependencies (marked as optional)

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
ObservationDaprClient.java	Decorator implementing DaprClient to wrap all non-deprecated method calls with Micrometer observations and high-cardinality key values
ObservationDaprWorkflowClient.java	Subclass of DaprWorkflowClient that overrides non-deprecated methods to wrap calls with observations
DaprClientAutoConfiguration.java	Updated to conditionally wrap clients with observation decorators when an ObservationRegistry is present
DaprClientSB4AutoConfiguration.java	Spring Boot 4 variant with same observation-wrapping logic
pom.xml (both variants)	Added micrometer-observation dependencies as optional dependencies
Test files	Comprehensive test coverage for observation creation, error handling, and auto-configuration behavior

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