kcenon::monitoring::absent_trigger Class Reference

Trigger when no data is received for a period. More...

#include <alert_triggers.h>

Inheritance diagram for kcenon::monitoring::absent_trigger:

Collaboration diagram for kcenon::monitoring::absent_trigger:

Public Member Functions
	absent_trigger (std::chrono::milliseconds absent_duration)
	Construct an absent trigger.
bool	evaluate (double) const override
	Evaluate the trigger condition.
std::string	type_name () const override
	Get trigger type name.
std::string	description () const override
	Get human-readable description.
void	reset ()
	Reset last seen timestamp.
Public Member Functions inherited from kcenon::monitoring::alert_trigger
virtual	~alert_trigger ()=default

Private Attributes
std::chrono::milliseconds	absent_duration_
std::mutex	mutex_
std::chrono::steady_clock::time_point	last_seen_ {}

Detailed Description

Trigger when no data is received for a period.

Useful for detecting when a metric stops being reported, indicating a potential issue with the monitored service.

Definition at line 655 of file alert_triggers.h.

Constructor & Destructor Documentation

absent_trigger()

kcenon::monitoring::absent_trigger::absent_trigger ( std::chrono::milliseconds absent_duration )

inlineexplicit

Construct an absent trigger.

Parameters

absent_duration

Duration without data before triggering

Examples

/home/runner/work/monitoring_system/monitoring_system/include/kcenon/monitoring/alert/alert_triggers.h.

Definition at line 661 of file alert_triggers.h.

        : absent_duration_(absent_duration) {}

Member Function Documentation

description()

std::string kcenon::monitoring::absent_trigger::description ( ) const

inlineoverridevirtual

Get human-readable description.

Returns

Description string

Implements kcenon::monitoring::alert_trigger.

Examples

/home/runner/work/monitoring_system/monitoring_system/include/kcenon/monitoring/alert/alert_triggers.h.

Definition at line 685 of file alert_triggers.h.

                                           {
        return "no data for " + std::to_string(absent_duration_.count()) + "ms";
    }

References absent_duration_.

evaluate()

bool kcenon::monitoring::absent_trigger::evaluate ( double value ) const

inlineoverridevirtual

Evaluate the trigger condition.

Parameters

value

Current metric value

Returns

True if trigger condition is met

Implements kcenon::monitoring::alert_trigger.

Examples

/home/runner/work/monitoring_system/monitoring_system/include/kcenon/monitoring/alert/alert_triggers.h.

Definition at line 664 of file alert_triggers.h.

                                           {
        auto now = std::chrono::steady_clock::now();
 
        std::lock_guard<std::mutex> lock(mutex_);
 
        auto previous = last_seen_;
        last_seen_ = now;
 
        // First evaluation - not absent yet
        if (previous == std::chrono::steady_clock::time_point{}) {
            return false;
        }
 
        // Check if the gap since previous value exceeds threshold
        return (now - previous) > absent_duration_;
    }

References absent_duration_, last_seen_, and mutex_.

reset()

void kcenon::monitoring::absent_trigger::reset ( )

inline

Reset last seen timestamp.

Examples

/home/runner/work/monitoring_system/monitoring_system/include/kcenon/monitoring/alert/alert_triggers.h.

Definition at line 692 of file alert_triggers.h.

                 {
        std::lock_guard<std::mutex> lock(mutex_);
        last_seen_ = std::chrono::steady_clock::time_point{};
    }

References last_seen_, and mutex_.

type_name()

std::string kcenon::monitoring::absent_trigger::type_name ( ) const

inlineoverridevirtual

Get trigger type name.

Returns

Type name string

Implements kcenon::monitoring::alert_trigger.

Examples

/home/runner/work/monitoring_system/monitoring_system/include/kcenon/monitoring/alert/alert_triggers.h.

Definition at line 681 of file alert_triggers.h.

                                         {
        return "absent";
    }

Member Data Documentation

absent_duration_

std::chrono::milliseconds kcenon::monitoring::absent_trigger::absent_duration_

private

Examples

/home/runner/work/monitoring_system/monitoring_system/include/kcenon/monitoring/alert/alert_triggers.h.

Definition at line 698 of file alert_triggers.h.

Referenced by description(), and evaluate().

last_seen_

std::chrono::steady_clock::time_point kcenon::monitoring::absent_trigger::last_seen_ {}

mutableprivate

Examples

/home/runner/work/monitoring_system/monitoring_system/include/kcenon/monitoring/alert/alert_triggers.h.

Definition at line 700 of file alert_triggers.h.

{};

Referenced by evaluate(), and reset().

mutex_

std::mutex kcenon::monitoring::absent_trigger::mutex_

mutableprivate

Examples

/home/runner/work/monitoring_system/monitoring_system/include/kcenon/monitoring/alert/alert_triggers.h.

Definition at line 699 of file alert_triggers.h.

Referenced by evaluate(), and reset().

---

The documentation for this class was generated from the following file:

• include/kcenon/monitoring/alert/alert_triggers.h