tusker_push/lib/tusker_push_web/telemetry.ex

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Elixir
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defmodule TuskerPushWeb.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
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# {:telemetry_poller, measurements: periodic_measurements(), period: 10_000},
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# Add reporters as children of your supervision tree.
# {Telemetry.Metrics.ConsoleReporter, metrics: metrics()}
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{TelemetryMetricsPrometheus, [metrics: prometheus_metrics()]}
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]
Supervisor.init(children, strategy: :one_for_one)
end
def metrics do
[
# Phoenix Metrics
summary("phoenix.endpoint.start.system_time",
unit: {:native, :millisecond}
),
summary("phoenix.endpoint.stop.duration",
unit: {:native, :millisecond}
),
summary("phoenix.router_dispatch.start.system_time",
tags: [:route],
unit: {:native, :millisecond}
),
summary("phoenix.router_dispatch.exception.duration",
tags: [:route],
unit: {:native, :millisecond}
),
summary("phoenix.router_dispatch.stop.duration",
tags: [:route],
unit: {:native, :millisecond}
),
summary("phoenix.socket_connected.duration",
unit: {:native, :millisecond}
),
summary("phoenix.channel_joined.duration",
unit: {:native, :millisecond}
),
summary("phoenix.channel_handled_in.duration",
tags: [:event],
unit: {:native, :millisecond}
),
# 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
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# TODO: I would love to consolidate this with the OpenTelemetry stuff, but elixir metrics api is
# undocumented and "experimental"
defp prometheus_metrics do
[
counter("apns.push.count", event_name: [:apns, :push], measurement: :monotonic_time)
]
end
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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.
# {TuskerPushWeb, :count_users, []}
]
end
end