daily-tracker

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telemetry.ex (3038B)

      1 defmodule DailyTrackerWeb.Telemetry do
      2   use Supervisor
      3   import Telemetry.Metrics
      4 
      5   def start_link(arg) do
      6     Supervisor.start_link(__MODULE__, arg, name: __MODULE__)
      7   end
      8 
      9   @impl true
     10   def init(_arg) do
     11     children = [
     12       # Telemetry poller will execute the given period measurements
     13       # every 10_000ms. Learn more here: https://hexdocs.pm/telemetry_metrics
     14       {:telemetry_poller, measurements: periodic_measurements(), period: 10_000}
     15       # Add reporters as children of your supervision tree.
     16       # {Telemetry.Metrics.ConsoleReporter, metrics: metrics()}
     17     ]
     18 
     19     Supervisor.init(children, strategy: :one_for_one)
     20   end
     21 
     22   def metrics do
     23     [
     24       # Phoenix Metrics
     25       summary("phoenix.endpoint.start.system_time",
     26         unit: {:native, :millisecond}
     27       ),
     28       summary("phoenix.endpoint.stop.duration",
     29         unit: {:native, :millisecond}
     30       ),
     31       summary("phoenix.router_dispatch.start.system_time",
     32         tags: [:route],
     33         unit: {:native, :millisecond}
     34       ),
     35       summary("phoenix.router_dispatch.exception.duration",
     36         tags: [:route],
     37         unit: {:native, :millisecond}
     38       ),
     39       summary("phoenix.router_dispatch.stop.duration",
     40         tags: [:route],
     41         unit: {:native, :millisecond}
     42       ),
     43       summary("phoenix.socket_connected.duration",
     44         unit: {:native, :millisecond}
     45       ),
     46       sum("phoenix.socket_drain.count"),
     47       summary("phoenix.channel_joined.duration",
     48         unit: {:native, :millisecond}
     49       ),
     50       summary("phoenix.channel_handled_in.duration",
     51         tags: [:event],
     52         unit: {:native, :millisecond}
     53       ),
     54 
     55       # Database Metrics
     56       summary("daily_tracker.repo.query.total_time",
     57         unit: {:native, :millisecond},
     58         description: "The sum of the other measurements"
     59       ),
     60       summary("daily_tracker.repo.query.decode_time",
     61         unit: {:native, :millisecond},
     62         description: "The time spent decoding the data received from the database"
     63       ),
     64       summary("daily_tracker.repo.query.query_time",
     65         unit: {:native, :millisecond},
     66         description: "The time spent executing the query"
     67       ),
     68       summary("daily_tracker.repo.query.queue_time",
     69         unit: {:native, :millisecond},
     70         description: "The time spent waiting for a database connection"
     71       ),
     72       summary("daily_tracker.repo.query.idle_time",
     73         unit: {:native, :millisecond},
     74         description:
     75           "The time the connection spent waiting before being checked out for the query"
     76       ),
     77 
     78       # VM Metrics
     79       summary("vm.memory.total", unit: {:byte, :kilobyte}),
     80       summary("vm.total_run_queue_lengths.total"),
     81       summary("vm.total_run_queue_lengths.cpu"),
     82       summary("vm.total_run_queue_lengths.io")
     83     ]
     84   end
     85 
     86   defp periodic_measurements do
     87     [
     88       # A module, function and arguments to be invoked periodically.
     89       # This function must call :telemetry.execute/3 and a metric must be added above.
     90       # {DailyTrackerWeb, :count_users, []}
     91     ]
     92   end
     93 end