bryancall opened a new pull request, #12900:
URL: https://github.com/apache/trafficserver/pull/12900

   * **New `unmarshal_milestone_diff()` function** -- outputs a single `-` 
character when the marshalled milestone difference is negative (i.e., one or 
both milestones were unset), instead of the literal string `-1`. This makes log 
parsing cleaner: parsers can distinguish "0 ms" (a valid sub-millisecond 
timing) from "not applicable" without checking for a magic integer sentinel.
   
   * **MSDMS container uses new unmarshal function** -- `LogField.cc` now 
assigns `unmarshal_milestone_diff` instead of the generic 
`unmarshal_int_to_str` for MSDMS fields.
   
   **Example output change:**
   ```
   # Before: unset milestone shows -1
   c_tls=-1 dns=-1 o_tcp=-1
   
   # After: unset milestone shows -
   c_tls=- dns=- o_tcp=-
   ```
   
   **Testing:** Validated with the milestone logging autest from #12899 
(updated to accept `-` as a valid sentinel). Manual verification with 
`traffic_logcat` on binary logs.
   


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