dpol1 commented on PR #9154:
URL: https://github.com/apache/storm/pull/9154#issuecomment-6410946955

   1. Done in 0926fbc2b: each test in `TopologyTracingTest` now starts its own 
cluster, as in `TupleTracerTest`.
   2. I updated the references in the description. The cost numbers keep the 
commits they were measured on, which tags on my fork now hold, and the 
description says they predate the later commits. Squash on merge is fine with 
me.
   
   On `spoutEmit`: I'd keep the signature unchanged for this first version. The 
hook runs synchronously during emission (now stated in its Javadoc, 474897204), 
so a tracer could use context made current by the spout or its instrumentation. 
Direct extraction from message data would still need an API extension; I'd 
defer that until we have a concrete integration. The bundled OTel tracer 
continues to start new roots, as documented.
   


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