Claudio Ortolina
141 lines
4.0 KiB
Elixir
141 lines
4.0 KiB
Elixir
defmodule MusicLibraryWeb.Telemetry do
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use Supervisor
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import Telemetry.Metrics
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def start_link(arg) do
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Supervisor.start_link(__MODULE__, arg, name: __MODULE__)
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end
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@impl true
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def init(_arg) do
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children = [
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{MusicLibraryWeb.Telemetry.Storage, metrics()},
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# Telemetry poller will execute the given period measurements
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# every 30 seconds. Learn more here: https://hexdocs.pm/telemetry_metrics
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{:telemetry_poller, measurements: periodic_measurements(), period: 30_000}
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# Add reporters as children of your supervision tree.
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# {Telemetry.Metrics.ConsoleReporter, metrics: metrics()}
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]
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Supervisor.init(children, strategy: :one_for_one)
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end
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def metrics do
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[
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# Database Metrics
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summary("music_library.repo.query.total_time",
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unit: {:native, :millisecond},
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description: "The sum of the other measurements",
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reporter_options: [
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nav: "Repo"
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],
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tags: [:source]
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),
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summary("music_library.repo.query.query_time",
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unit: {:native, :millisecond},
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description: "The time spent executing the query",
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reporter_options: [
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nav: "Repo"
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],
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tags: [:source]
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),
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summary("music_library.repo.query.queue_time",
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unit: {:native, :millisecond},
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description: "The time spent waiting for a database connection",
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reporter_options: [
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nav: "Repo"
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],
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tags: [:source]
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),
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# HTTP Metrics
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summary("finch.request.stop.duration",
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unit: {:native, :millisecond},
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tags: [:normalized_path],
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tag_values: &add_tags/1,
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drop: &drop_unwanted_hosts/1,
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reporter_options: [
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nav: "External APIs"
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]
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),
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summary("finch.request.stop.duration",
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unit: {:native, :millisecond},
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tags: [:host],
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tag_values: &add_tags/1,
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drop: &drop_unwanted_hosts/1,
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reporter_options: [
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nav: "External APIs"
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]
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),
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# Rate Limiter
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summary("req.rate_limiter.throttle.sleep_ms",
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unit: :millisecond,
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description: "Time spent waiting for rate limit cooldown",
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tags: [:name],
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reporter_options: [
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nav: "External APIs"
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]
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),
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# Assets
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summary("music_library.assets.cache_size",
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unit: {:byte, :kilobyte},
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reporter_options: [nav: "Assets"]
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),
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summary("music_library.assets.content_size",
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unit: {:byte, :megabyte},
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reporter_options: [nav: "Assets"]
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),
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# Error Tracker
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counter("error_tracker.error.new.system_time",
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description: "New errors tracked",
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reporter_options: [nav: "Error Tracker"]
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),
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counter("error_tracker.error.resolved.system_time",
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description: "Errors marked as resolved",
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reporter_options: [nav: "Error Tracker"]
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),
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counter("error_tracker.error.unresolved.system_time",
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description: "Errors marked as unresolved",
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reporter_options: [nav: "Error Tracker"]
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),
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counter("error_tracker.occurrence.new.system_time",
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description: "New error occurrences",
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reporter_options: [nav: "Error Tracker"]
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),
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# VM Metrics
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summary("vm.memory.total", unit: {:byte, :megabyte}),
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summary("vm.total_run_queue_lengths.total"),
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summary("vm.total_run_queue_lengths.cpu"),
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summary("vm.total_run_queue_lengths.io")
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]
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end
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defp periodic_measurements do
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[
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{MusicLibrary.Assets, :track_total_cache_size, []},
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{MusicLibrary.Assets, :track_total_content_size, []}
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# A module, function and arguments to be invoked periodically.
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# This function must call :telemetry.execute/3 and a metric must be added above.
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# {MusicLibraryWeb, :count_users, []}
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]
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end
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defp add_tags(metadata) do
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req = metadata.request
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Map.merge(metadata, %{
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host: req.host,
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normalized_path: URI.parse(req.path).path
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})
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end
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defp drop_unwanted_hosts(metadata) do
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metadata.request.host =~ "archive.org"
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end
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end
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