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prometheus
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6.0.2
6.0.1
6.0.0
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5.1.0
5.0.0
4.13.0
retired
4.12.0
4.11.0
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4.2.0
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3.5.0
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3.4.5
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3.4.1
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3.3.0
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1.5.0
1.0.2
1.0.1
1.0.0
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0.1.3
0.1.2
0.1.1
0.1.0
Prometheus.io client in Erlang
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Files
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Files
src/prometheus_buckets.erl
-module(prometheus_buckets).
-export([default/0,
linear/3,
exponential/3,
generate_linear/3,
generate_exponential/3]).
%%====================================================================
%% Public API
%%====================================================================
default () ->
[0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1, 2.5, 5, 10].
linear(_Start, _Step, Count) when Count < 1 ->
erlang:error({invalid_value, Count, "Buckets count should be positive"});
linear(Start, Step, Count) ->
Bounds = lists:seq(Start, Start + Step*(Count - 1), Step),
[try_to_maintain_integer_bounds(Bound) || Bound <- Bounds].
exponential(_Start, _Factor, Count) when Count < 1 ->
erlang:error({invalid_value, Count, "Buckets count should be positive"});
exponential(Start, _Factor, _Count) when Start =< 0 ->
erlang:error({invalid_value, Start, "Buckets start should be positive"});
exponential(_Start, Factor, _Count) when Factor =< 1 ->
erlang:error({invalid_value, Factor, "Buckets factor should be greater than 1"});
exponential(Start, Factor, Count) ->
[try_to_maintain_integer_bounds(Start*math:pow(Factor, I)) || I <- lists:seq(0, Count-1)].
%%===================================================================
%% Deprecations
%%===================================================================
generate_linear(Start, Step, Count) ->
error_logger:warning_msg("prometheus_buckets:generate_linear/3 is deprecated and soon will be removed. Please use prometeus_buckets:linear/3 instead.~n"),
linear(Start, Step, Count).
generate_exponential(Start, Factor, Count) ->
error_logger:warning_msg("prometheus_buckets:generate_exponential/3 is deprecated and soon will be removed. Please use prometeus_buckets:exponential/3 instead.~n"),
exponential(Start, Factor, Count).
%%====================================================================
%% Private Parts
%%====================================================================
try_to_maintain_integer_bounds(Bound) when is_integer(Bound) ->
Bound;
try_to_maintain_integer_bounds(Bound) when is_float(Bound) ->
TBound = trunc(Bound),
case TBound == Bound of
true -> TBound;
false -> Bound
end.