epugh opened a new pull request, #4892:
URL: https://github.com/apache/solr/pull/4892

   https://issues.apache.org/jira/browse/SOLR-17864
   
   
   
   # Description
   
   Migrate some tracing property names.
   
   # Solution
   
   Do the migration.  thanks claude.
   
   # Tests
   
   Did some end to end testing:
   
   ```
   1. Built a real dev distribution: ./gradlew dev → solr/packaging/build/dev.
   2. Started Solr with the old deprecated properties: 
-Dsolr.traceHostName=migration-test-host -Dsolr.traceIdHeader=X-My-Trace-Test.
   3. Confirmed the deprecation shim fires correctly in server/logs/solr.log:
   WARN ... Deprecated system property solr.traceHostName has been replaced by 
solr.tracing.host.name. ...
   WARN ... Deprecated system property solr.traceIdHeader has been replaced by 
solr.tracing.id.header. ...
   4. Confirmed the values actually threaded through via the live properties 
API:
   GET /api/node/properties/solr.tracing.host.name → "migration-test-host"
   GET /api/node/properties/solr.tracing.id.header → "X-My-Trace-Test"
   5. Confirmed the server is healthy overall: GET /api/node/health → 
{"status":"OK"}.
   6. Stopped the instance cleanly.
   ```
   


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