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hackney

3.0.1
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Simple HTTP client with HTTP/1.1, HTTP/2, and HTTP/3 support

Security advisory: This version has known vulnerabilities. View advisories
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hackney src hackney_metrics_backend.erl
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src/hackney_metrics_backend.erl 

%%% -*- erlang -*-

%%%

%%% This file is part of hackney released under the Apache 2 license.

%%% See the NOTICE for more information.

%%%

%%% Copyright (c) 2012-2026 Benoît Chesneau <benoitc@e-engura.org>

%%%



-module(hackney_metrics_backend).

-author("benoitc").



%% Behaviour callbacks for hackney metrics backends

%%

%% Implementations must export all callback functions.

%% See hackney_metrics_dummy for a reference implementation.



%% Counter operations (monotonically increasing)

-callback counter_inc(Name :: atom(), Labels :: map()) -> ok.

-callback counter_inc(Name :: atom(), Labels :: map(), Value :: number()) -> ok.



%% Gauge operations (can go up or down)

-callback gauge_set(Name :: atom(), Labels :: map(), Value :: number()) -> ok.

-callback gauge_inc(Name :: atom(), Labels :: map()) -> ok.

-callback gauge_dec(Name :: atom(), Labels :: map()) -> ok.



%% Histogram operations (for timing/distribution measurements)

-callback histogram_observe(Name :: atom(), Labels :: map(), Value :: number()) -> ok.



%% Metric lifecycle

-callback declare_counter(Name :: atom(), Help :: binary(), LabelKeys :: [atom()]) -> ok.

-callback declare_gauge(Name :: atom(), Help :: binary(), LabelKeys :: [atom()]) -> ok.

-callback declare_histogram(Name :: atom(), Help :: binary(), LabelKeys :: [atom()]) -> ok.

-callback declare_histogram(Name :: atom(), Help :: binary(), LabelKeys :: [atom()], Buckets :: [number()]) -> ok.