View Source CozyTelemetry (cozy_telemetry v0.5.1)
Provides a modular approach for using beam-telemetry packages.
Quick Start
Before running CozyTelemetry
, you must provide some modules. For example:
defmodule MyApp.Cache.TelemetrySpec do
use CozyTelemetry.Spec
@impl true
def metrics(_meta) do
[
summary("cache.duration",
unit: {:native, :second},
tags: [:type, :key]
),
last_value("cache.stats.hits",
event_name: "cache.stats",
measurement: :hits,
tags: [:cache]
)
]
end
@impl true
def measurements(meta) do
[
{__MODULE__, :dispatch_stats, []}
]
end
end
Then, set some base configuration within config/config.exs
:
config :my_app, CozyTelemetry,
meta: [],
specs: [
MyApp.Cache.TelemetrySpec
],
reporter: {:console, []},
poller: [period: 10_000]
Use the application configuration you've already set and include CozyTelemetry.*
in the list of
supervised children:
# lib/my_app/application.ex
def start(_type, _args) do
cozy_telemetry_config = Application.fetch_env!(:my_app, CozyTelemetry)
children = [
{CozyTelemetry.Reporter, cozy_telemetry_config},
{CozyTelemetry.Poller, cozy_telemetry_config},
# ...
]
Supervisor.start_link(children, strategy: :one_for_one, name: MyApp.Supervisor)
end
about option :meta
The value of option :meta
is a keyword list, which will be passed as the argument of:
- callback
metrics/1
ofCozyTelemetry.Spec
. - callback
measurements/1
ofCozyTelemetry.Spec
.
See CozyTelemetry.Spec
for more details.
about option :specs
The value of option :specs
is a list of spec modules.
See CozyTelemetry.Spec
for more details.
about option :optional_specs
Same as option :specs
, but ignore errors when the given spec module is missing.
When using
:cozy_telemetry
as a direct dependency, this option is unnecessary. But, when building a new package on:cozy_telemetry
, this option is useful for some case, such as auto loading measurements modules.
about option :reporter
The value of option :reporter
specifies the reporter and its options, which is in format of
{type, reporter_opts}
:
- available values of
type
are:console
,:statsd
,prometheus
. - available values of
reporter_opts
can be found in corresponding underlying modules:
about option :poller
The value of option :poller
is the options of :telemetry_poller.start_link/1
.