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Add support for metric name suffixes for distribution #73

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Add support for metric name suffixes for distribution #73

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12 changes: 8 additions & 4 deletions lib/core/exporter.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -53,20 +53,24 @@ defmodule TelemetryMetricsPrometheus.Core.Exporter do

has_labels = map_size(labels) > 0

sample_name = "#{name}_" <> Keyword.get(metric.reporter_options, :bucket_suffix, "bucket")
sum_name = "#{name}_" <> Keyword.get(metric.reporter_options, :sum_suffix, "sum")
count_name = "#{name}_" <> Keyword.get(metric.reporter_options, :count_suffix, "count")

samples =
Enum.map_join(buckets, "\n", fn {upper_bound, count} ->
if has_labels do
~s(#{name}_bucket{#{format_labels(labels)},le="#{upper_bound}"} #{count})
~s(#{sample_name}{#{format_labels(labels)},le="#{upper_bound}"} #{count})
else
~s(#{name}_bucket{le="#{upper_bound}"} #{count})
~s(#{sample_name}{le="#{upper_bound}"} #{count})
end
end)

summary =
if has_labels do
"#{name}_sum{#{format_labels(labels)}} #{sum}\n#{name}_count{#{format_labels(labels)}} #{count}"
"#{sum_name}{#{format_labels(labels)}} #{sum}\n#{count_name}{#{format_labels(labels)}} #{count}"
else
"#{name}_sum #{sum}\n#{name}_count #{count}"
"#{sum_name} #{sum}\n#{count_name} #{count}"
end

Enum.join([samples, summary], "\n")
Expand Down