Tracing docs and release notes entry.

Signed-off-by: Caleb Gilmour <caleb.gilmour@datadoghq.com>
envoyproxy · Aug 22, 2019 · 958947f · 958947f
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diff --git a/docs/root/intro/arch_overview/observability/tracing.rst b/docs/root/intro/arch_overview/observability/tracing.rst
@@ -93,9 +93,12 @@ associated with it. Each span generated by Envoy contains the following data:
 * Originating host set via :option:`--service-node`.
 * Downstream cluster set via the :ref:`config_http_conn_man_headers_downstream-service-cluster`
   header.
-* HTTP URL.
-* HTTP method.
-* HTTP response code.
+* HTTP request URL, method, protocol and user-agent.
+* Additional HTTP request headers set via :ref:`request_headers_for_tags
+  <envoy_api_field_config.filter.network.http_connection_manager.v2.HttpConnectionManager.tracing.request_headers_for_tags>`
+* HTTP response status code.
+* GRPC response status and message (if available).
+* An error tag when HTTP status is 5xx or GRPC status is not "OK"
 * Tracing system-specific metadata.
 
 The span also includes a name (or operation) which by default is defined as the host of the invoked

diff --git a/docs/root/intro/version_history.rst b/docs/root/intro/version_history.rst
@@ -38,6 +38,7 @@ Version history
 * router check tool: add comprehensive coverage reporting.
 * tls: added verification of IP address SAN fields in certificates against configured SANs in the
   certificate validation context.
+* tracing: added tags for gRPC response status and meesage.
 * upstream: added network filter chains to upstream connections, see :ref:`filters<envoy_api_field_Cluster.filters>`.
 * upstream: use p2c to select hosts for least-requests load balancers if all host weights are the same, even in cases where weights are not equal to 1.
 * zookeeper: parse responses and emit latency stats.