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95d1146fea
approx_exponential_histogram uses similar logic to Prometheus native histogram, to allow Prometheus sending its data in a native histogram format it needs to report schema and min id (id of the first bucket). This patch update to_metrics_histogram to set those optional parameters, leaving it to the Prometheus to decide in what format the histogram will be reported. Signed-off-by: Amnon Heiman <amnon@scylladb.com>
49 lines
1.7 KiB
C++
49 lines
1.7 KiB
C++
/*
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* Copyright (C) 2020-present ScyllaDB
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*
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* Modified by ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#pragma once
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#include <cstdint>
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#include <seastar/core/metrics_types.hh>
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#include "seastarx.hh"
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#include "estimated_histogram.hh"
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#include "histogram.hh"
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template<uint64_t Min, uint64_t Max, size_t Precision>
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seastar::metrics::histogram to_metrics_histogram(const utils::approx_exponential_histogram<Min, Max, Precision>& hist) {
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seastar::metrics::histogram res;
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static constexpr size_t MIN_ID = log2ceil(Min) * Precision + 1;
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static constexpr size_t Schema = log2floor(Precision);
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res.buckets.resize(hist.size() - 1);
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uint64_t cummulative_count = 0;
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res.sample_sum = 0;
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res.native_histogram = seastar::metrics::native_histogram_info{Schema, MIN_ID};
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for (size_t i = 0; i < hist.NUM_BUCKETS - 1; i++) {
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auto& v = res.buckets[i];
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v.upper_bound = hist.get_bucket_lower_limit(i + 1);
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cummulative_count += hist.get(i);
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v.count = cummulative_count;
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res.sample_sum += hist.get(i) * v.upper_bound;
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}
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// The count serves as the infinite bucket
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res.sample_count = cummulative_count + hist.get(hist.NUM_BUCKETS - 1);
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res.sample_sum += hist.get(hist.NUM_BUCKETS - 1) * hist.get_bucket_lower_limit(hist.NUM_BUCKETS - 1);
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return res;
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}
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/*!
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* \brief get a metrics summary from timed_rate_moving_average_with_summary
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*
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* timed_rate_moving_average_with_summary contains a summary. This function
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* copy it to a metric summary.
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* A metric summary is a histogram where each bucket holds some quantile.
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*/
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seastar::metrics::histogram to_metrics_summary(const utils::summary_calculator& summary) noexcept;
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