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diff --git a/doc/environment_variables.md b/doc/environment_variables.md
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--- a/doc/environment_variables.md
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@@ -69,6 +69,7 @@ some configuration as environment variables that can be set.
The following tracers will only run in binaries built in DEBUG mode. This is
accomplished by invoking `CONFIG=dbg make <target>`
+ - alarm_refcount - refcounting traces for grpc_alarm structure
- metadata - tracks creation and mutation of metadata
- closure - tracks closure creation, scheduling, and completion
- pending_tags - traces still-in-progress tags on completion queues