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{{% alert title=Warning color=warning %}}

Client instrumentation for the browser is **experimental** and mostly
**unspecified**. If you are interested in helping out, get in touch with the
[Client Instrumentation SIG][sig].

[sig]:
  https://docs.google.com/document/d/16Vsdh-DM72AfMg_FIt9yT9ExEWF4A_vRbQ3jRNBe09w

{{% /alert %}}
