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prometheus

6.1.2
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Prometheus.io client in Erlang

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prometheus src prometheus.erl
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src/prometheus.erl 

-module(prometheus).

-if(?OTP_RELEASE >= 27).

-define(MODULEDOC(Str), -moduledoc(Str)).

-define(DOC(Str), -doc(Str)).

-else.

-define(MODULEDOC(Str), -compile([])).

-define(DOC(Str), -compile([])).

-endif.



-behaviour(application).



-type label_name() :: dynamic().

-type label_value() :: dynamic().

-type label() :: {label_name(), label_value()}.

-type pre_rendered_labels() :: binary().

-type labels() :: [label()] | #{label_name() => label_value()} | pre_rendered_labels().

-type value() :: float() | integer() | undefined | infinity.

-type prometheus_boolean() :: boolean() | number() | list() | undefined.

-type gauge() :: value() | {value()} | {labels(), value()}.

-type counter() :: value() | {value()} | {labels(), value()}.

-type untyped() :: value() | {value()} | {labels(), value()}.

-type summary() ::

    {non_neg_integer(), value()}

    | {labels(), non_neg_integer(), value()}.

-type buckets() :: nonempty_list({prometheus_buckets:bucket_bound(), non_neg_integer()}).

-type histogram() ::

    {buckets(), non_neg_integer(), value()}

    | {labels(), buckets(), non_neg_integer(), value()}.

-type pbool() ::

    prometheus_boolean()

    | {prometheus_boolean()}

    | {labels(), prometheus_boolean()}.

-type tmetric() ::

    gauge()

    | counter()

    | untyped()

    | summary()

    | histogram()

    | pbool().

-type metrics() :: tmetric() | [tmetric()].



-export_type([

    label/0,

    labels/0,

    label_name/0,

    label_value/0,

    value/0,

    gauge/0,

    counter/0,

    summary/0,

    histogram/0,

    buckets/0,

    metrics/0,

    untyped/0,

    pbool/0,

    prometheus_boolean/0

]).



-export([start/2, stop/1]).

-export([start/0, stop/0]).



-spec start(application:start_type(), dynamic()) -> supervisor:startlink_ret().

start(_StartType, _StartArgs) ->

    prometheus_sup:start_link().



-spec stop(dynamic()) -> ok.

stop(_State) ->

    ok.



?DOC(false).

-spec start() -> ok | {error, dynamic()}.

start() ->

    case application:ensure_all_started(?MODULE) of

        {ok, _} ->

            ok;

        Error ->

            Error

    end.



?DOC(false).

-spec stop() -> ok | {error, dynamic()}.

stop() ->

    application:stop(?MODULE).