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callMethod decided the rpc.command span's status from the Status the handler
returned. Handler.cpp registers 70 of its 72 methods through byRef(), which
returns a default Status whatever happened, because an old-style handler
reports its error in the reply body instead. So a failed account_info or a
refused path_find came out with rpc_status=success and span status Ok.
That is the opposite of what the comment above the code claimed it did, and it
left a {status.code=error} query blind to every non-throwing RPC error.
The status now comes from the reply as well as the Status, which covers both
handler styles. byRef() is unchanged and identical to develop: it behaves
correctly for its own purpose, and no RPC reply changes. Only telemetry was
reading the wrong signal.
setOk() is dropped rather than moved. The specification reserves Ok for an
operator asserting verified success and warns that a tool may treat it as
suppressing errors, so a successful call now leaves the status Unset.
No test accompanies this: the Beast tree has no telemetry fixture and the
in-memory span exporter is linked only into xrpl_tests, which cannot reach
daemon code. Asserting the exported status needs that infrastructure first.