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opentelemetry_api lib open_telemetry observer.ex
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lib/open_telemetry/observer.ex

defmodule OpenTelemetry.Observer do
@moduledoc """
require OpenTelemetry.Observer
OpenTelemetry.Observer.set_callback(\"some.counter\", fn o -> OpenTelemetry.Observer.observe(o, 33, []))
"""
defmacro set_callback(observer, callback) do
quote do
:ot_meter.set_observer_callback(:opentelemetry.get_meter(__MODULE__), unquote(observer), unquote(callback))
end
end
defdelegate observe(observer_result, number, label_set), to: :ot_observer
end