prometheus_telemetry

defmodule <%= @module_name %> do
  import Telemetry.Metrics, only: <%= inspect(@metrics_imports) %>

  <%= if Enum.any?(@metrics, &(&1[:type] === :distribution)) do %>
  @buckets PrometheusTelemetry.Config.default_millisecond_buckets()
  <% end %>

  def metrics do
    [
    <% last_metric = List.last(@metrics) %>
    <%= for metric <- @metrics do %>
      <%= to_string(metric[:type]) %>(
        "<%= metric[:metric_name] %>",
        event_name: <%= inspect(metric[:event_name]) %>,
        measurement: :<%= metric[:measurement] %><%= if metric[:tags] !== [] || metric[:unit] do %>,<% end %>
        <%= if metric[:unit] do %>unit: {:naive, :<%= metric[:unit] %>},
        reporter_options: [buckets: <%= "@buckets" %>]<%= if metric[:tags] !== [] do %>,<% end %><% end %>
        <%= if metric[:tags] !== [] do %>tags: <%= inspect(metric[:tags]) %><% end %>
      )<%= if metric !== last_metric do %>,<% end %>

    <% end %>
    ]
  end

  <%= for metric <- @metrics do %>
    <%= if metric[:type] === :counter do %>
    def inc_<%= metric[:event_function] %> do
      :telemetry.execute(
        <%= inspect(metric[:event_name]) %>,
        %{<%= metric[:measurement] %>: 1},
        %{}
      )
    end
    <% end %>

    <%= if metric[:type] === :distribution do %>
    def observe_<%= metric[:event_function] %>(value) do
      :telemetry.execute(
        <%= inspect(metric[:event_name]) %>,
        %{<%= metric[:measurement] %>: value},
        %{}
      )
    end
    <% end %>

    <%= if metric[:type] === :last_value do %>
    def set_<%= metric[:event_function] %>(value) do
      :telemetry.execute(
        <%= inspect(metric[:event_name]) %>,
        %{<%= metric[:measurement] %>: value},
        %{}
      )
    end
    <% end %>

    <%= if metric[:type] === :sum do %>
    def observe_<%= metric[:event_function] %>(value) do
      :telemetry.execute(
        <%= inspect(metric[:event_name]) %>,
        %{<%= metric[:measurement] %>: value},
        %{}
      )
    end
    <% end %>
  <% end %>
end