Add DebugTraceKey to sample toml
#
SamplingParam: "0.15"
+ # Requests that have X-Debug-Trace header set with the value of DebugTraceKey will
+ # force sampling, and additionally will have the Trace ID returned in their responses
+ # on the X-Debug-Trace header.
+ DebugTraceKey = ""
+
[tracing.jaeger]
# SamplingServerURL is the address to the sampling server
#
