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diff --git a/lib/tesla/middleware/telemetry.ex b/lib/tesla/middleware/telemetry.ex
index 1d1f357..9ffac7a 100644
--- a/lib/tesla/middleware/telemetry.ex
+++ b/lib/tesla/middleware/telemetry.ex
@@ -1,30 +1,32 @@
-defmodule Tesla.Middleware.Telemetry do
- @behaviour Tesla.Middleware
+if Code.ensure_loaded?(:telemetry) do
+ defmodule Tesla.Middleware.Telemetry do
+ @behaviour Tesla.Middleware
- @moduledoc """
- Send the request time and meta-information through telemetry.
+ @moduledoc """
+ Send the request time and meta-information through telemetry.
- ### Example usage
- ```
- defmodule MyClient do
- use Tesla
+ ### Example usage
+ ```
+ defmodule MyClient do
+ use Tesla
- plug Tesla.Middleware.Telemetry
+ plug Tesla.Middleware.Telemetry
- end
+ end
- :telemetry.attach("my-tesla-telemetry", [:tesla, :request], fn event, time, meta, config ->
- # Do something with the event
- end)
- ```
+ :telemetry.attach("my-tesla-telemetry", [:tesla, :request], fn event, time, meta, config ->
+ # Do something with the event
+ end)
+ ```
- Please check the [telemetry](https://hexdocs.pm/telemetry/) for the further usage.
- """
+ Please check the [telemetry](https://hexdocs.pm/telemetry/) for the further usage.
+ """
- @doc false
- def call(env, next, _opts) do
- {time, res} = :timer.tc(Tesla, :run, [env, next])
- :telemetry.execute([:tesla, :request], %{request_time: time}, %{result: res})
- res
+ @doc false
+ def call(env, next, _opts) do
+ {time, res} = :timer.tc(Tesla, :run, [env, next])
+ :telemetry.execute([:tesla, :request], %{request_time: time}, %{result: res})
+ res
+ end
end
end

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