ClickHouse/dbms/Interpreters/MetricLog.h

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#pragma once
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#include <Interpreters/SystemLog.h>
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#include <Common/ProfileEvents.h>
#include <Common/CurrentMetrics.h>
#include <vector>
#include <atomic>
#include <ctime>
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namespace DB
{
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/** MetricLog is a log of metric values measured at regular time interval.
*/
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struct MetricLogElement
{
time_t event_time{};
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UInt64 milliseconds{};
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std::vector<ProfileEvents::Count> profile_events;
std::vector<CurrentMetrics::Metric> current_metrics;
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static std::string name() { return "MetricLog"; }
static Block createBlock();
void appendToBlock(Block & block) const;
};
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class MetricLog : public SystemLog<MetricLogElement>
{
using SystemLog<MetricLogElement>::SystemLog;
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public:
/// Launches a background thread to collect metrics with interval
void startCollectMetric(size_t collect_interval_milliseconds_);
/// Stop background thread. Call before shutdown.
void stopCollectMetric();
private:
void metricThreadFunction();
ThreadFromGlobalPool metric_flush_thread;
size_t collect_interval_milliseconds;
std::atomic<bool> is_shutdown_metric_thread{false};
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};
}