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defmodule WeatherTrackerWeb.Telemetry do
use Supervisor
import Telemetry.Metrics
def start_link(arg) do
Supervisor.start_link(__MODULE__, arg, name: __MODULE__)
end
@impl true
def init(_arg) do
children = [
# Telemetry poller will execute the given period measurements
# every 10_000ms. Learn more here: https://hexdocs.pm/telemetry_metrics
{:telemetry_poller, measurements: periodic_measurements(), period: 10_000}
# Add reporters as children of your supervision tree.
# {Telemetry.Metrics.ConsoleReporter, metrics: metrics()}
]
Supervisor.init(children, strategy: :one_for_one)
end
def metrics do
[
# Phoenix Metrics
summary("phoenix.endpoint.stop.duration",
unit: {:native, :millisecond}
),
summary("phoenix.router_dispatch.stop.duration",
tags: [:route],
unit: {:native, :millisecond}
),
# Database Metrics
summary("weather_tracker.repo.query.total_time",
unit: {:native, :millisecond},
description: "The sum of the other measurements"
),
summary("weather_tracker.repo.query.decode_time",
unit: {:native, :millisecond},
description: "The time spent decoding the data received from the database"
),
summary("weather_tracker.repo.query.query_time",
unit: {:native, :millisecond},
description: "The time spent executing the query"
),
summary("weather_tracker.repo.query.queue_time",
unit: {:native, :millisecond},
description: "The time spent waiting for a database connection"
),
summary("weather_tracker.repo.query.idle_time",
unit: {:native, :millisecond},
description:
"The time the connection spent waiting before being checked out for the query"
),
# VM Metrics
summary("vm.memory.total", unit: {:byte, :kilobyte}),
summary("vm.total_run_queue_lengths.total"),
summary("vm.total_run_queue_lengths.cpu"),
summary("vm.total_run_queue_lengths.io")
]
end
defp periodic_measurements do
[
# A module, function and arguments to be invoked periodically.
# This function must call :telemetry.execute/3 and a metric must be added above.
# {WeatherTrackerWeb, :count_users, []}
]
end
end