Revision history for Punk-OpenTelemetry

0.07    2026-08-26
        - An outbound call joins the trace it was made from.
        - A traceparent the caller already set is honoured as the parent and
        replaced in place.
        - Punk::OpenTelemetry::SpanRef, a BORROWED span handle with no
        DESTROY: the request's span belongs to the instrumentation, and a
        handle to it in the owning class would free what the response side
        is about to end.
        - Span: add sampled, child_of and traceparent.
        - The logs signal is the application's own logger: $c->log is tapped
        through pk_abi v4 and exported with its request's trace id. 
        - REMOVED: the $c->otel_log helper

0.06    2026-08-26
        - Metrics and logs encode. Both encoders existed in the header and the
        exporter never dispatched to them, so every signal but traces was
        refused at the last step.
        - One eval per signal in flush. A failure in any one signal aborted
        the block, so metrics failing to encode meant logs were never
        drained: two signals lost to one broken encoder.

0.05    2026-08-23
        - Fixed the module failing to load with "undefined symbol:
          clock_gettime" on glibc before 2.17 (Debian wheezy, reported by
          CPAN Testers on 5.20, 5.22 and 5.24). clock_gettime lives in librt
          there, so the configure probe now retries with -lrt and links it
          when that is what makes it work.

0.04    2026-08-20
        - FIX: change abi version checks from == to <=
        - Fixed a SEGFAULT on perls before 5.32, POPs
        - Fixed t/07-metrics.t failing on every perl built uselongdouble

0.03    2026-08-20
        - Fixed a SEGFAULT on perls before 5.20, reported by CPAN Testers
          against 0.01 on 5.18.2 (FreeBSD 9.2, gcc 4.2.1) and 5.18.4
          (Linux, gcc 12). Eleven XSUBs returned by assigning &PL_sv_undef to an
          SV* RETVAL. The typemap mortalises RETVAL, so each of those
          returns decremented the refcount of an IMMORTAL and before
          5.20 immortals have no refcount protection, so the decrements
          are real and the SV is eventually freed underneath the
          interpreter. 

0.02    2026-08-19
        - Fixed a SEGFAULT on perls before 5.20, reported by CPAN Testers
          against 0.01 on 5.18.2 (FreeBSD 9.2, gcc 4.2.1) and 5.18.4
          (Linux, gcc 12). Eleven XSUBs returned by assigning &PL_sv_undef to an
          SV* RETVAL. The typemap mortalises RETVAL, so each of those
          returns decremented the refcount of an IMMORTAL and before
          5.20 immortals have no refcount protection, so the decrements
          are real and the SV is eventually freed underneath the
          interpreter. 

0.01    2026-08-19
	First version