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diff --git a/doc/environment_variables.md b/doc/environment_variables.md
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@@ -49,6 +49,7 @@ some configuration as environment variables that can be set.
- connectivity_state - traces connectivity state changes to channels
- channel_stack_builder - traces information about channel stacks being built
- executor - traces grpc's internal thread pool ('the executor')
+ - fd_trace - traces fd creation, shutdown and closure.
- glb - traces the grpclb load balancer
- handshaker - traces handshaking state
- http - traces state in the http2 transport engine