feat: add ability to configure number of required points (#5242)

frontend/public/locales/en-GB/alerts.json

@@ -118,6 +118,8 @@
 	"exceptions_based_alert_desc": "Send a notification when a condition occurs in the exceptions data.",
 	"field_unit": "Threshold unit",
 	"text_alert_on_absent": "Send a notification if data is missing for",
+	"text_require_min_points": "Run alert evaluation only when there are minimum of",
+	"text_num_points": "data points in each result group",
 	"text_alert_frequency": "Run alert every",
 	"text_for": "minutes",
 	"selected_query_placeholder": "Select query"

frontend/public/locales/en/alerts.json

@@ -118,6 +118,8 @@
 	"exceptions_based_alert_desc": "Send a notification when a condition occurs in the exceptions data.",
 	"field_unit": "Threshold unit",
 	"text_alert_on_absent": "Send a notification if data is missing for",
+	"text_require_min_points": "Run alert evaluation only when there are minimum of",
+	"text_num_points": "data points in each result group",
 	"text_alert_frequency": "Run alert every",
 	"text_for": "minutes",
 	"selected_query_placeholder": "Select query"

frontend/src/container/FormAlertRules/RuleOptions.tsx

@@ -323,6 +323,45 @@ function RuleOptions({
 										<Typography.Text>{t('text_for')}</Typography.Text>
 									</Space>
 								</VerticalLine>
+
+								<VerticalLine>
+									<Space direction="horizontal" align="center">
+										<Form.Item noStyle name={['condition', 'requireMinPoints']}>
+											<Checkbox
+												checked={alertDef?.condition?.requireMinPoints}
+												onChange={(e): void => {
+													setAlertDef({
+														...alertDef,
+														condition: {
+															...alertDef.condition,
+															requireMinPoints: e.target.checked,
+														},
+													});
+												}}
+											/>
+										</Form.Item>
+										<Typography.Text>{t('text_require_min_points')}</Typography.Text>
+
+										<Form.Item noStyle name={['condition', 'requiredNumPoints']}>
+											<InputNumber
+												min={1}
+												value={alertDef?.condition?.requiredNumPoints}
+												onChange={(value): void => {
+													setAlertDef({
+														...alertDef,
+														condition: {
+															...alertDef.condition,
+															requiredNumPoints: Number(value) || 0,
+														},
+													});
+												}}
+												type="number"
+												onWheel={(e): void => e.currentTarget.blur()}
+											/>
+										</Form.Item>
+										<Typography.Text>{t('text_num_points')}</Typography.Text>
+									</Space>
+								</VerticalLine>
 							</Space>
 						</Collapse.Panel>
 					</Collapse>

frontend/src/types/api/alerts/def.ts

@@ -37,6 +37,8 @@ export interface RuleCondition {
 	selectedQueryName?: string;
 	alertOnAbsent?: boolean | undefined;
 	absentFor?: number | undefined;
+	requireMinPoints?: boolean | undefined;
+	requiredNumPoints?: number | undefined;
 }
 export interface Labels {
 	[key: string]: string;

pkg/query-service/rules/alerting.go

@@ -116,6 +116,8 @@ type RuleCondition struct {
 	Algorithm         string             `json:"algorithm,omitempty"`
 	Seasonality       string             `json:"seasonality,omitempty"`
 	SelectedQuery     string             `json:"selectedQueryName,omitempty"`
+	RequireMinPoints  bool               `yaml:"requireMinPoints,omitempty" json:"requireMinPoints,omitempty"`
+	RequiredNumPoints int                `yaml:"requiredNumPoints,omitempty" json:"requiredNumPoints,omitempty"`
 }
 
 func (rc *RuleCondition) GetSelectedQueryName() string {

pkg/query-service/rules/base_rule.go

@@ -353,6 +353,13 @@ func (r *BaseRule) ShouldAlert(series v3.Series) (Sample, bool) {
 		return alertSmpl, false
 	}
 
+	if r.ruleCondition.RequireMinPoints {
+		if len(series.Points) < r.ruleCondition.RequiredNumPoints {
+			zap.L().Info("not enough data points to evaluate series, skipping", zap.String("ruleid", r.ID()), zap.Int("numPoints", len(series.Points)), zap.Int("requiredPoints", r.ruleCondition.RequiredNumPoints))
+			return alertSmpl, false
+		}
+	}
+
 	switch r.matchType() {
 	case AtleastOnce:
 		// If any sample matches the condition, the rule is firing.

pkg/query-service/rules/base_rule_test.go

@@ -0,0 +1,64 @@
+package rules
+
+import (
+	"testing"
+
+	v3 "go.signoz.io/signoz/pkg/query-service/model/v3"
+)
+
+func TestBaseRule_RequireMinPoints(t *testing.T) {
+	threshold := 1.0
+	tests := []struct {
+		name        string
+		rule        *BaseRule
+		shouldAlert bool
+		series      *v3.Series
+	}{
+		{
+			name: "test should skip if less than min points",
+			rule: &BaseRule{
+				ruleCondition: &RuleCondition{
+					RequireMinPoints:  true,
+					RequiredNumPoints: 4,
+				},
+			},
+			series: &v3.Series{
+				Points: []v3.Point{
+					{Value: 1},
+					{Value: 2},
+				},
+			},
+			shouldAlert: false,
+		},
+		{
+			name: "test should alert if more than min points",
+			rule: &BaseRule{
+				ruleCondition: &RuleCondition{
+					RequireMinPoints:  true,
+					RequiredNumPoints: 4,
+					CompareOp:         ValueIsAbove,
+					MatchType:         AtleastOnce,
+					Target:            &threshold,
+				},
+			},
+			series: &v3.Series{
+				Points: []v3.Point{
+					{Value: 1},
+					{Value: 2},
+					{Value: 3},
+					{Value: 4},
+				},
+			},
+			shouldAlert: true,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			_, shouldAlert := test.rule.ShouldAlert(*test.series)
+			if shouldAlert != test.shouldAlert {
+				t.Errorf("expected shouldAlert to be %v, got %v", test.shouldAlert, shouldAlert)
+			}
+		})
+	}
+}