akkoma/lib/pleroma/web/telemetry.ex
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Use fallbacks of summary metrics for prometheus
2024-02-12 02:00:09 +01:00

239 lines
7.7 KiB
Elixir

defmodule Pleroma.Web.Telemetry do
use Supervisor
import Telemetry.Metrics
alias Pleroma.Stats
alias Pleroma.Config
def start_link(arg) do
Supervisor.start_link(__MODULE__, arg, name: __MODULE__)
end
@impl true
def init(_arg) do
children =
[
{:telemetry_poller, measurements: periodic_measurements(), period: 10_000}
] ++
prometheus_children()
Supervisor.init(children, strategy: :one_for_one)
end
defp prometheus_children do
config = Config.get([:instance, :export_prometheus_metrics], true)
if config do
[
{TelemetryMetricsPrometheus.Core, metrics: prometheus_metrics()},
Pleroma.PrometheusExporter
]
else
[]
end
end
# A seperate set of metrics for distributions because phoenix dashboard does NOT handle them well
defp distribution_metrics do
[
distribution(
"phoenix.router_dispatch.stop.duration",
# event_name: [:pleroma, :repo, :query, :total_time],
measurement: :duration,
unit: {:native, :second},
tags: [:route],
reporter_options: [
buckets: [0.1, 0.2, 0.5, 1, 2.5, 5, 10, 25, 50, 100, 250, 500, 1000]
]
),
# Database Time Metrics
distribution(
"pleroma.repo.query.total_time",
# event_name: [:pleroma, :repo, :query, :total_time],
measurement: :total_time,
unit: {:native, :millisecond},
reporter_options: [
buckets: [0.1, 0.2, 0.5, 1, 2.5, 5, 10, 25, 50, 100, 250, 500, 1000]
]
),
distribution(
"pleroma.repo.query.queue_time",
# event_name: [:pleroma, :repo, :query, :total_time],
measurement: :queue_time,
unit: {:native, :millisecond},
reporter_options: [
buckets: [0.01, 0.025, 0.05, 0.1, 0.2, 0.5, 1, 2.5, 5, 10]
]
),
distribution(
"oban_job_exception",
event_name: [:oban, :job, :exception],
measurement: :duration,
tags: [:worker],
tag_values: fn tags -> Map.put(tags, :worker, tags.job.worker) end,
unit: {:native, :second},
reporter_options: [
buckets: [0.01, 0.025, 0.05, 0.1, 0.2, 0.5, 1, 2.5, 5, 10]
]
),
distribution(
"tesla_request_completed",
event_name: [:tesla, :request, :stop],
measurement: :duration,
tags: [:response_code],
tag_values: fn tags -> Map.put(tags, :response_code, tags.env.status) end,
unit: {:native, :second},
reporter_options: [
buckets: [0.01, 0.025, 0.05, 0.1, 0.2, 0.5, 1, 2.5, 5, 10]
]
),
distribution(
"oban_job_completion",
event_name: [:oban, :job, :stop],
measurement: :duration,
tags: [:worker],
tag_values: fn tags -> Map.put(tags, :worker, tags.job.worker) end,
unit: {:native, :second},
reporter_options: [
buckets: [0.01, 0.025, 0.05, 0.1, 0.2, 0.5, 1, 2.5, 5, 10]
]
)
]
end
# Summary metrics are currently not (yet) supported by the prometheus exporter
defp summary_metrics(byte_unit) do
[
# Phoenix Metrics
summary("phoenix.endpoint.stop.duration",
unit: {:native, :millisecond}
),
summary("phoenix.router_dispatch.stop.duration",
tags: [:route],
unit: {:native, :millisecond}
),
summary("pleroma.repo.query.total_time", unit: {:native, :millisecond}),
summary("pleroma.repo.query.decode_time", unit: {:native, :millisecond}),
summary("pleroma.repo.query.query_time", unit: {:native, :millisecond}),
summary("pleroma.repo.query.queue_time", unit: {:native, :millisecond}),
summary("pleroma.repo.query.idle_time", unit: {:native, :millisecond}),
# VM Metrics
summary("vm.memory.total", unit: {:byte, byte_unit}),
summary("vm.total_run_queue_lengths.total"),
summary("vm.total_run_queue_lengths.cpu"),
summary("vm.total_run_queue_lengths.io")
]
end
defp sum_counter_pair(basename, opts) do
[
sum(basename <> ".psum", opts),
counter(basename <> ".pcount", opts)
]
end
# Prometheus exporter doesn't support summaries, so provide fallbacks
defp summary_fallback_metrics(byte_unit \\ :byte) do
# Summary metrics are not supported by the Prometheus exporter
# https://github.com/beam-telemetry/telemetry_metrics_prometheus_core/issues/11
# and sum metrics currently only work with integers
# https://github.com/beam-telemetry/telemetry_metrics_prometheus_core/issues/35
#
# For VM metrics this is kindof ok as they appear to always be integers
# and we can use sum + counter to get the average between polls from their change
# But for repo query times we need to use a full distribution
simple_buckets = [0, 1, 2, 4, 8, 16]
simple_buckets_quick = for t <- simple_buckets, do: t / 100.0
# Already included in distribution metrics anyway:
# phoenix.router_dispatch.stop.duration
# pleroma.repo.query.total_time
# pleroma.repo.query.queue_time
dist_metrics =
[
distribution("phoenix.endpoint.stop.duration.fdist",
event_name: [:phoenix, :endpoint, :stop],
measurement: :duration,
unit: {:native, :millisecond},
reporter_options: [
buckets: simple_buckets
]
),
distribution("pleroma.repo.query.decode_time.fdist",
event_name: [:pleroma, :repo, :query],
measurement: :decode_time,
unit: {:native, :millisecond},
reporter_options: [
buckets: simple_buckets_quick
]
),
distribution("pleroma.repo.query.query_time.fdist",
event_name: [:pleroma, :repo, :query],
measurement: :query_time,
unit: {:native, :millisecond},
reporter_options: [
buckets: simple_buckets
]
),
distribution("pleroma.repo.query.idle_time.fdist",
event_name: [:pleroma, :repo, :query],
measurement: :idle_time,
unit: {:native, :millisecond},
reporter_options: [
buckets: simple_buckets
]
)
]
vm_metrics =
sum_counter_pair("vm.memory.total",
event_name: [:vm, :memory],
measurement: :total,
unit: {:byte, byte_unit}
) ++
sum_counter_pair("vm.total_run_queue_lengths.total",
event_name: [:vm, :total_run_queue_lengths],
measurement: :total
) ++
sum_counter_pair("vm.total_run_queue_lengths.cpu",
event_name: [:vm, :total_run_queue_lengths],
measurement: :cpu
) ++
sum_counter_pair("vm.total_run_queue_lengths.io.fsum",
event_name: [:vm, :total_run_queue_lengths],
measurement: :io
)
dist_metrics ++ vm_metrics
end
defp common_metrics do
[
last_value("pleroma.local_users.total"),
last_value("pleroma.domains.total"),
last_value("pleroma.local_statuses.total"),
last_value("pleroma.remote_users.total")
]
end
def prometheus_metrics,
do: common_metrics() ++ distribution_metrics() ++ summary_fallback_metrics()
def live_dashboard_metrics, do: common_metrics() ++ summary_metrics(:megabyte)
defp periodic_measurements do
[
{__MODULE__, :instance_stats, []}
]
end
def instance_stats do
stats = Stats.get_stats()
:telemetry.execute([:pleroma, :local_users], %{total: stats.user_count}, %{})
:telemetry.execute([:pleroma, :domains], %{total: stats.domain_count}, %{})
:telemetry.execute([:pleroma, :local_statuses], %{total: stats.status_count}, %{})
:telemetry.execute([:pleroma, :remote_users], %{total: stats.remote_user_count}, %{})
end
end