rules

package
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 Go to latest Published: Jan 28, 2021 License: Apache-2.0 Imports: 25 Imported by: 0

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Functions

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Types

type Alert 

type Alert struct {
	State AlertState

	Labels      labels.Labels
	Annotations labels.Labels

	// The value at the last evaluation of the alerting expression.
	Value float64
	// The interval during which the condition of this alert held true.
	// ResolvedAt will be 0 to indicate a still active alert.
	ActiveAt   time.Time
	FiredAt    time.Time
	ResolvedAt time.Time
	LastSentAt time.Time
	ValidUntil time.Time
}

Alert is the user-level representation of a single instance of an alerting rule.

type AlertState 

type AlertState int

AlertState denotes the state of an active alert. 

const (
	// StateInactive is the state of an alert that is neither firing nor pending.
	StateInactive AlertState = iota
	// StatePending is the state of an alert that has been active for less than
	// the configured threshold duration.
	StatePending
	// StateFiring is the state of an alert that has been active for longer than
	// the configured threshold duration.
	StateFiring
)

func (AlertState) String 

func (s AlertState) String() string

type AlertingRule 

type AlertingRule struct {
	// contains filtered or unexported fields
}

An AlertingRule generates alerts from its vector expression.

func NewAlertingRule 

func NewAlertingRule(
	name string, vec promql.Expr, hold time.Duration,
	labels, annotations, externalLabels labels.Labels,
	restored bool, logger log.Logger,
) *AlertingRule

NewAlertingRule constructs a new AlertingRule.

func (*AlertingRule) ActiveAlerts 

func (r *AlertingRule) ActiveAlerts() []*Alert

ActiveAlerts returns a slice of active alerts.

func (*AlertingRule) Annotations 

func (r *AlertingRule) Annotations() labels.Labels

Annotations returns the annotations of the alerting rule.

func (*AlertingRule) Duration 

func (r *AlertingRule) Duration() time.Duration

Duration returns the hold duration of the alerting rule.

func (*AlertingRule) Eval 

func (r *AlertingRule) Eval(ctx context.Context, ts time.Time, query QueryFunc, externalURL *url.URL) (promql.Vector, error)

Eval evaluates the rule expression and then creates pending alerts and fires or removes previously pending alerts accordingly.

func (*AlertingRule) ForEachActiveAlert 

func (r *AlertingRule) ForEachActiveAlert(f func(*Alert))

ForEachActiveAlert runs the given function on each alert. This should be used when you want to use the actual alerts from the AlertingRule and not on its copy. If you want to run on a copy of alerts then don't use this, get the alerts from 'ActiveAlerts()'.

func (*AlertingRule) GetEvaluationDuration 

func (r *AlertingRule) GetEvaluationDuration() time.Duration

GetEvaluationDuration returns the time in seconds it took to evaluate the alerting rule.

func (*AlertingRule) GetEvaluationTimestamp 

func (r *AlertingRule) GetEvaluationTimestamp() time.Time

GetEvaluationTimestamp returns the time the evaluation took place.

func (*AlertingRule) HTMLSnippet 

func (r *AlertingRule) HTMLSnippet(pathPrefix string) html_template.HTML

HTMLSnippet returns an HTML snippet representing this alerting rule. The resulting snippet is expected to be presented in a <pre> element, so that line breaks and other returned whitespace is respected.

func (*AlertingRule) Health 

func (r *AlertingRule) Health() RuleHealth

Health returns the current health of the alerting rule.

func (*AlertingRule) HoldDuration 

func (r *AlertingRule) HoldDuration() time.Duration

HoldDuration returns the holdDuration of the alerting rule.

func (*AlertingRule) Labels 

func (r *AlertingRule) Labels() labels.Labels

Labels returns the labels of the alerting rule.

func (*AlertingRule) LastError 

func (r *AlertingRule) LastError() error

LastError returns the last error seen by the alerting rule.

func (*AlertingRule) Name 

func (r *AlertingRule) Name() string

Name returns the name of the alerting rule.

func (*AlertingRule) Query 

func (r *AlertingRule) Query() promql.Expr

Query returns the query expression of the alerting rule.

func (*AlertingRule) SetEvaluationDuration 

func (r *AlertingRule) SetEvaluationDuration(dur time.Duration)

SetEvaluationDuration updates evaluationDuration to the duration it took to evaluate the rule on its last evaluation.

func (*AlertingRule) SetEvaluationTimestamp 

func (r *AlertingRule) SetEvaluationTimestamp(ts time.Time)

SetEvaluationTimestamp updates evaluationTimestamp to the timestamp of when the rule was last evaluated.

func (*AlertingRule) SetHealth 

func (r *AlertingRule) SetHealth(health RuleHealth)

SetHealth sets the current health of the alerting rule.

func (*AlertingRule) SetLastError 

func (r *AlertingRule) SetLastError(err error)

SetLastError sets the current error seen by the alerting rule.

func (*AlertingRule) SetRestored 

func (r *AlertingRule) SetRestored(restored bool)

SetRestored updates the restoration state of the alerting rule.

func (*AlertingRule) State 

func (r *AlertingRule) State() AlertState

State returns the maximum state of alert instances for this rule. StateFiring > StatePending > StateInactive

func (*AlertingRule) String 

func (r *AlertingRule) String() string

type Appendable 

type Appendable interface {
	Appender() (storage.Appender, error)
}

Appendable returns an Appender.

type Group 

type Group struct {
	// contains filtered or unexported fields
}

Group is a set of rules that have a logical relation.

func NewGroup 

func NewGroup(name, file string, interval time.Duration, rules []Rule, shouldRestore bool, opts *ManagerOptions) *Group

NewGroup makes a new Group with the given name, options, and rules.

func (*Group) AlertingRules 

func (g *Group) AlertingRules() []*AlertingRule

AlertingRules returns the list of the group's alerting rules.

func (*Group) CopyState 

func (g *Group) CopyState(from *Group)

CopyState copies the alerting rule and staleness related state from the given group.

Rules are matched based on their name and labels. If there are duplicates, the first is matched with the first, second with the second etc.

func (*Group) Eval 

func (g *Group) Eval(ctx context.Context, ts time.Time)

Eval runs a single evaluation cycle in which all rules are evaluated sequentially.

func (*Group) File 

func (g *Group) File() string

File returns the group's file.

func (*Group) GetEvaluationDuration 

func (g *Group) GetEvaluationDuration() time.Duration

GetEvaluationDuration returns the time in seconds it took to evaluate the rule group.

func (*Group) GetEvaluationTimestamp 

func (g *Group) GetEvaluationTimestamp() time.Time

GetEvaluationTimestamp returns the time the last evaluation of the rule group took place.

func (*Group) HasAlertingRules 

func (g *Group) HasAlertingRules() bool

HasAlertingRules returns true if the group contains at least one AlertingRule.

func (*Group) Interval 

func (g *Group) Interval() time.Duration

Interval returns the group's interval.

func (*Group) Name 

func (g *Group) Name() string

Name returns the group name.

func (*Group) RestoreForState 

func (g *Group) RestoreForState(ts time.Time)

RestoreForState restores the 'for' state of the alerts by looking up last ActiveAt from storage.

func (*Group) Rules 

func (g *Group) Rules() []Rule

Rules returns the group's rules.

type Manager 

type Manager struct {
	// contains filtered or unexported fields
}

The Manager manages recording and alerting rules.

func NewManager 

func NewManager(o *ManagerOptions) *Manager

NewManager returns an implementation of Manager, ready to be started by calling the Run method.

func (*Manager) AlertingRules 

func (m *Manager) AlertingRules() []*AlertingRule

AlertingRules returns the list of the manager's alerting rules.

func (*Manager) Collect 

func (m *Manager) Collect(ch chan<- prometheus.Metric)

Collect implements prometheus.Collector.

func (*Manager) Describe 

func (m *Manager) Describe(ch chan<- *prometheus.Desc)

Describe implements prometheus.Collector.

func (*Manager) LoadGroups 

func (m *Manager) LoadGroups(
	interval time.Duration, externalLabels labels.Labels, filenames ...string,
) (map[string]*Group, []error)

LoadGroups reads groups from a list of files.

func (*Manager) RuleGroups 

func (m *Manager) RuleGroups() []*Group

RuleGroups returns the list of manager's rule groups.

func (*Manager) Rules 

func (m *Manager) Rules() []Rule

Rules returns the list of the manager's rules.

func (*Manager) Run 

func (m *Manager) Run()

Run starts processing of the rule manager.

func (*Manager) Stop 

func (m *Manager) Stop()

Stop the rule manager's rule evaluation cycles.

func (*Manager) Update 

func (m *Manager) Update(interval time.Duration, files []string, externalLabels labels.Labels) error

Update the rule manager's state as the config requires. If loading the new rules failed the old rule set is restored.

type ManagerOptions 

type ManagerOptions struct {
	ExternalURL     *url.URL
	QueryFunc       QueryFunc
	NotifyFunc      NotifyFunc
	Context         context.Context
	Appendable      Appendable
	TSDB            storage.Storage
	Logger          log.Logger
	Registerer      prometheus.Registerer
	OutageTolerance time.Duration
	ForGracePeriod  time.Duration
	ResendDelay     time.Duration

	Metrics *Metrics
}

ManagerOptions bundles options for the Manager.

type Metrics 

type Metrics struct {
	// contains filtered or unexported fields
}

Metrics for rule evaluation.

func NewGroupMetrics 

func NewGroupMetrics(reg prometheus.Registerer) *Metrics

NewGroupMetrics makes a new Metrics and registers them with the provided registerer, if not nil.

type NotifyFunc 

type NotifyFunc func(ctx context.Context, expr string, alerts ...*Alert)

NotifyFunc sends notifications about a set of alerts generated by the given expression.

type QueryFunc 

type QueryFunc func(ctx context.Context, q string, t time.Time) (promql.Vector, error)

QueryFunc processes PromQL queries.

func EngineQueryFunc 

func EngineQueryFunc(engine *promql.Engine, q storage.Queryable) QueryFunc

EngineQueryFunc returns a new query function that executes instant queries against the given engine. It converts scalar into vector results.

type RecordingRule 

type RecordingRule struct {
	// contains filtered or unexported fields
}

A RecordingRule records its vector expression into new timeseries.

func NewRecordingRule 

func NewRecordingRule(name string, vector promql.Expr, lset labels.Labels) *RecordingRule

NewRecordingRule returns a new recording rule.

func (*RecordingRule) Eval 

func (rule *RecordingRule) Eval(ctx context.Context, ts time.Time, query QueryFunc, _ *url.URL) (promql.Vector, error)

Eval evaluates the rule and then overrides the metric names and labels accordingly.

func (*RecordingRule) GetEvaluationDuration 

func (rule *RecordingRule) GetEvaluationDuration() time.Duration

GetEvaluationDuration returns the time in seconds it took to evaluate the recording rule.

func (*RecordingRule) GetEvaluationTimestamp 

func (rule *RecordingRule) GetEvaluationTimestamp() time.Time

GetEvaluationTimestamp returns the time the evaluation took place.

func (*RecordingRule) HTMLSnippet 

func (rule *RecordingRule) HTMLSnippet(pathPrefix string) template.HTML

HTMLSnippet returns an HTML snippet representing this rule.

func (*RecordingRule) Health 

func (rule *RecordingRule) Health() RuleHealth

Health returns the current health of the recording rule.

func (*RecordingRule) Labels 

func (rule *RecordingRule) Labels() labels.Labels

Labels returns the rule labels.

func (*RecordingRule) LastError 

func (rule *RecordingRule) LastError() error

LastError returns the last error seen by the recording rule.

func (*RecordingRule) Name 

func (rule *RecordingRule) Name() string

Name returns the rule name.

func (*RecordingRule) Query 

func (rule *RecordingRule) Query() promql.Expr

Query returns the rule query expression.

func (*RecordingRule) SetEvaluationDuration 

func (rule *RecordingRule) SetEvaluationDuration(dur time.Duration)

SetEvaluationDuration updates evaluationDuration to the time in seconds it took to evaluate the rule on its last evaluation.

func (*RecordingRule) SetEvaluationTimestamp 

func (rule *RecordingRule) SetEvaluationTimestamp(ts time.Time)

SetEvaluationTimestamp updates evaluationTimestamp to the timestamp of when the rule was last evaluated.

func (*RecordingRule) SetHealth 

func (rule *RecordingRule) SetHealth(health RuleHealth)

SetHealth sets the current health of the recording rule.

func (*RecordingRule) SetLastError 

func (rule *RecordingRule) SetLastError(err error)

SetLastError sets the current error seen by the recording rule.

func (*RecordingRule) String 

func (rule *RecordingRule) String() string

type Rule 

type Rule interface {
	Name() string
	// Labels of the rule.
	Labels() labels.Labels
	// eval evaluates the rule, including any associated recording or alerting actions.
	Eval(context.Context, time.Time, QueryFunc, *url.URL) (promql.Vector, error)
	// String returns a human-readable string representation of the rule.
	String() string
	// SetLastErr sets the current error experienced by the rule.
	SetLastError(error)
	// LastErr returns the last error experienced by the rule.
	LastError() error
	// SetHealth sets the current health of the rule.
	SetHealth(RuleHealth)
	// Health returns the current health of the rule.
	Health() RuleHealth
	SetEvaluationDuration(time.Duration)
	// GetEvaluationDuration returns last evaluation duration.
	// NOTE: Used dynamically by rules.html template.
	GetEvaluationDuration() time.Duration
	SetEvaluationTimestamp(time.Time)
	// GetEvaluationTimestamp returns last evaluation timestamp.
	// NOTE: Used dynamically by rules.html template.
	GetEvaluationTimestamp() time.Time
	// HTMLSnippet returns a human-readable string representation of the rule,
	// decorated with HTML elements for use the web frontend.
	HTMLSnippet(pathPrefix string) html_template.HTML
}

A Rule encapsulates a vector expression which is evaluated at a specified interval and acted upon (currently either recorded or used for alerting).

type RuleHealth 

type RuleHealth string

RuleHealth describes the health state of a rule. 

const (
	HealthUnknown RuleHealth = "unknown"
	HealthGood    RuleHealth = "ok"
	HealthBad     RuleHealth = "err"
)

The possible health states of a rule based on the last execution.

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