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-rw-r--r--doc/environment_variables.md11
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diff --git a/doc/environment_variables.md b/doc/environment_variables.md
index b472f7e126..d1172e62f4 100644
--- a/doc/environment_variables.md
+++ b/doc/environment_variables.md
@@ -52,6 +52,7 @@ some configuration as environment variables that can be set.
traces epoll-fd creation/close calls for epollex polling engine
- glb - traces the grpclb load balancer
- handshaker - traces handshaking state
+ - health_check_client - traces health checking client code
- http - traces state in the http2 transport engine
- http2_stream_state - traces all http2 stream state mutations.
- http1 - traces HTTP/1.x operations performed by gRPC
@@ -139,3 +140,13 @@ some configuration as environment variables that can be set.
* grpc_cfstream
set to 1 to turn on CFStream experiment. With this experiment gRPC uses CFStream API to make TCP
connections. The option is only available on iOS platform and when macro GRPC_CFSTREAM is defined.
+
+* GRPC_ARENA_INIT_STRATEGY
+ Selects the initialization strategy for blocks allocated in the arena. Valid
+ values are:
+ - no_init (default): Do not inialize the arena block.
+ - zero_init: Initialize the arena blocks with 0.
+ - non_zero_init: Initialize the arena blocks with a non-zero value.
+
+ NOTE: This environment variable is experimental and will be removed. Thus, it
+ should not be relied upon.