Release note related to envoy #2787 (#567)

Signed-off-by: Gary Brown <gary@brownuk.com>
7 years ago · 09f35b98b6
parent 69bc09bfa0
commit 09f35b98b6
1 changed files with 3 additions and 0 deletions
--- a/docs/root/intro/version_history.rst
+++ b/docs/root/intro/version_history.rst
@ -11,6 +11,9 @@ Version history
 * admin: added ``/stats/prometheus`` as an alternative endpoint for getting stats in prometheus format.
 * logger: all :ref:`logging levels <operations_admin_interface_logging>` can be configured
  at run-time: trace debug info warning error critical.
+* tracing: the sampling decision is now delegated to the tracers, allowing the tracer to decide when and if
+  to use it. For example, if the :ref:`x-b3-sampled <config_http_conn_man_headers_x-b3-sampled>` header
+  is supplied with the client request, its value will override any sampling decision made by the Envoy proxy.

 1.6.0
 =====