Merge #151370

151370: tracing: remove unused WithRemoteParentFromLocalSpan option r=yuzefovich a=yuzefovich

Something I noticed while looking into other stuff.

Epic: None
Release note: None

Co-authored-by: Yahor Yuzefovich <[email protected]>

Author: craig[bot]

pkg/util/tracing/span_options.go

@@ -266,27 +266,6 @@ func (p remoteParent) apply(opts spanOptions) spanOptions {
 	return opts
 }
 
-type remoteParentFromLocalSpanOption spanRef
-
-func (r remoteParentFromLocalSpanOption) apply(opts spanOptions) spanOptions {
-	opts.RemoteParent = r.Meta()
-	sr := spanRef(r)
-	sr.release()
-	return opts
-}
-
-// WithRemoteParentFromLocalSpan is equivalent to
-// WithRemoteParentFromSpanMeta(sp.Meta()), but doesn't allocate. The span will
-// be created with parent info, but without being linked into the parent. This
-// is useful when the child needs to be created with a different Tracer than the
-// parent - e.g. when a tenant is calling into the local KV server.
-func WithRemoteParentFromLocalSpan(sp *Span) SpanOption {
-	ref, _ /* ok */ := tryMakeSpanRef(sp)
-	// Note that ref will be Empty if tryMakeSpanRef() failed. In that case, the
-	// resulting span will not have a parent.
-	return remoteParentFromLocalSpanOption(ref)
-}
-
 type remoteParentFromTraceInfoOpt tracingpb.TraceInfo
 
 var _ SpanOption = &remoteParentFromTraceInfoOpt{}