Prometheus_ecto not working

Hi Team,

Can someone let me know, how to use prometheus_ecto .

I did followed the sets provided in the documentation.
In Application startup

:ok =
[:my_app, :repo, :query],

Plug Module
defmodule MyApp.RepoInstrumenter do
@moduledoc “”"
Pipeline Instrumenter for Plugs
use Prometheus.EctoInstrumenter

After firing query, But still, i don’t see any event generating.