Merge pull request #301 from prometheus/feature/alerts-dashboard

Implement alerts dashboard and expression console links.

main.go

@@ -230,7 +230,7 @@ func main() {
 		PrometheusStatus: &web.PrometheusStatus{
 			BuildInfo:   BuildInfo,
 			Config:      conf.String(),
-			Rules:       ruleManager.Rules(),
+			RuleManager: ruleManager,
 			TargetPools: targetManager.Pools(),
 			Flags:       flags,
 			Birth:       time.Now(),
@@ -238,6 +238,10 @@ func main() {
 		CurationState: curationState,
 	}
 
+	alertsHandler := &web.AlertsHandler{
+		RuleManager: ruleManager,
+	}
+
 	databasesHandler := &web.DatabasesHandler{
 		Incoming: databaseStates,
 	}
@@ -252,6 +256,7 @@ func main() {
 		StatusHandler:    statusHandler,
 		MetricsHandler:   metricsService,
 		DatabasesHandler: databasesHandler,
+		AlertsHandler:    alertsHandler,
 	}
 
 	prometheus := prometheus{

model/metric.go

@@ -94,6 +94,14 @@ func (l LabelSet) ToMetric() Metric {
 	return metric
 }
 
+func (m Metric) ToLabelSet() LabelSet {
+	labels := LabelSet{}
+	for label, value := range m {
+		labels[label] = value
+	}
+	return labels
+}
+
 // A Metric is similar to a LabelSet, but the key difference is that a Metric is
 // a singleton and refers to one and only one stream of samples.
 type Metric map[LabelName]LabelValue

rules/alerting.go

@@ -15,19 +15,24 @@ package rules
 
 import (
 	"fmt"
+	"html/template"
+	"sync"
+	"time"
+
 	"github.com/prometheus/prometheus/model"
 	"github.com/prometheus/prometheus/rules/ast"
 	"github.com/prometheus/prometheus/stats"
 	"github.com/prometheus/prometheus/storage/metric"
 	"github.com/prometheus/prometheus/utility"
-	"time"
 )
 
 // States that active alerts can be in.
-type alertState int
+type AlertState int
 
-func (s alertState) String() string {
+func (s AlertState) String() string {
 	switch s {
+	case INACTIVE:
+		return "inactive"
 	case PENDING:
 		return "pending"
 	case FIRING:
@@ -38,32 +43,35 @@ func (s alertState) String() string {
 }
 
 const (
-	PENDING alertState = iota
+	INACTIVE AlertState = iota
+	PENDING
 	FIRING
 )
 
-// alert is used to track active (pending/firing) alerts over time.
-type alert struct {
+// Alert is used to track active (pending/firing) alerts over time.
+type Alert struct {
 	// The name of the alert.
-	name string
+	Name string
 	// The vector element labelset triggering this alert.
-	metric model.Metric
+	Labels model.LabelSet
 	// The state of the alert (PENDING or FIRING).
-	state alertState
+	State AlertState
 	// The time when the alert first transitioned into PENDING state.
-	activeSince time.Time
+	ActiveSince time.Time
+	// The value of the alert expression for this vector element.
+	Value model.SampleValue
 }
 
 // sample returns a Sample suitable for recording the alert.
-func (a alert) sample(timestamp time.Time, value model.SampleValue) model.Sample {
+func (a Alert) sample(timestamp time.Time, value model.SampleValue) model.Sample {
 	recordedMetric := model.Metric{}
-	for label, value := range a.metric {
+	for label, value := range a.Labels {
 		recordedMetric[label] = value
 	}
 
 	recordedMetric[model.MetricNameLabel] = model.AlertMetricName
-	recordedMetric[model.AlertNameLabel] = model.LabelValue(a.name)
-	recordedMetric[model.AlertStateLabel] = model.LabelValue(a.state.String())
+	recordedMetric[model.AlertNameLabel] = model.LabelValue(a.Name)
+	recordedMetric[model.AlertStateLabel] = model.LabelValue(a.State.String())
 
 	return model.Sample{
 		Metric:    recordedMetric,
@@ -83,37 +91,51 @@ type AlertingRule struct {
 	holdDuration time.Duration
 	// Extra labels to attach to the resulting alert sample vectors.
 	labels model.LabelSet
+
+	// Protects the below.
+	mutex sync.Mutex
 	// A map of alerts which are currently active (PENDING or FIRING), keyed by
 	// the fingerprint of the labelset they correspond to.
-	activeAlerts map[model.Fingerprint]*alert
+	activeAlerts map[model.Fingerprint]*Alert
 }
 
-func (rule AlertingRule) Name() string { return rule.name }
+func (rule *AlertingRule) Name() string { return rule.name }
 
-func (rule AlertingRule) EvalRaw(timestamp time.Time, storage *metric.TieredStorage) (ast.Vector, error) {
+func (rule *AlertingRule) EvalRaw(timestamp time.Time, storage *metric.TieredStorage) (ast.Vector, error) {
 	return ast.EvalVectorInstant(rule.vector, timestamp, storage, stats.NewTimerGroup())
 }
 
-func (rule AlertingRule) Eval(timestamp time.Time, storage *metric.TieredStorage) (ast.Vector, error) {
+func (rule *AlertingRule) Eval(timestamp time.Time, storage *metric.TieredStorage) (ast.Vector, error) {
 	// Get the raw value of the rule expression.
 	exprResult, err := rule.EvalRaw(timestamp, storage)
 	if err != nil {
 		return nil, err
 	}
 
+	rule.mutex.Lock()
+	defer rule.mutex.Unlock()
+
 	// Create pending alerts for any new vector elements in the alert expression.
 	resultFingerprints := utility.Set{}
 	for _, sample := range exprResult {
 		fp := *model.NewFingerprintFromMetric(sample.Metric)
 		resultFingerprints.Add(fp)
 
-		if _, ok := rule.activeAlerts[fp]; !ok {
-			rule.activeAlerts[fp] = &alert{
-				name:        rule.name,
-				metric:      sample.Metric,
-				state:       PENDING,
-				activeSince: timestamp,
+		alert, ok := rule.activeAlerts[fp]
+		if !ok {
+			labels := sample.Metric.ToLabelSet()
+			if _, ok := labels[model.MetricNameLabel]; ok {
+				delete(labels, model.MetricNameLabel)
 			}
+			rule.activeAlerts[fp] = &Alert{
+				Name:        rule.name,
+				Labels:      sample.Metric.ToLabelSet(),
+				State:       PENDING,
+				ActiveSince: timestamp,
+				Value:       sample.Value,
+			}
+		} else {
+			alert.Value = sample.Value
 		}
 	}
 
@@ -127,9 +149,9 @@ func (rule AlertingRule) Eval(timestamp time.Time, storage *metric.TieredStorage
 			continue
 		}
 
-		if activeAlert.state == PENDING && timestamp.Sub(activeAlert.activeSince) >= rule.holdDuration {
+		if activeAlert.State == PENDING && timestamp.Sub(activeAlert.ActiveSince) >= rule.holdDuration {
 			vector = append(vector, activeAlert.sample(timestamp, 0))
-			activeAlert.state = FIRING
+			activeAlert.State = FIRING
 		}
 
 		vector = append(vector, activeAlert.sample(timestamp, 1))
@@ -138,7 +160,7 @@ func (rule AlertingRule) Eval(timestamp time.Time, storage *metric.TieredStorage
 	return vector, nil
 }
 
-func (rule AlertingRule) ToDotGraph() string {
+func (rule *AlertingRule) ToDotGraph() string {
 	graph := fmt.Sprintf(`digraph "Rules" {
 	  %#p[shape="box",label="ALERT %s IF FOR %s"];
 		%#p -> %#p;
@@ -147,8 +169,47 @@ func (rule AlertingRule) ToDotGraph() string {
 	return graph
 }
 
-func (rule AlertingRule) String() string {
-	return fmt.Sprintf("ALERT %s IF %s FOR %s WITH %s\n", rule.name, rule.vector, utility.DurationToString(rule.holdDuration), rule.labels)
+func (rule *AlertingRule) String() string {
+	return fmt.Sprintf("ALERT %s IF %s FOR %s WITH %s", rule.name, rule.vector, utility.DurationToString(rule.holdDuration), rule.labels)
+}
+
+func (rule *AlertingRule) HTMLSnippet() template.HTML {
+	alertMetric := model.Metric{
+		model.MetricNameLabel: model.AlertMetricName,
+		model.AlertNameLabel:  model.LabelValue(rule.name),
+	}
+	return template.HTML(fmt.Sprintf(
+		`ALERT <a href="%s">%s</a> IF <a href="%s">%s</a> FOR %s WITH %s`,
+		ConsoleLinkForExpression(alertMetric.String()),
+		rule.name,
+		ConsoleLinkForExpression(rule.vector.String()),
+		rule.vector,
+		utility.DurationToString(rule.holdDuration),
+		rule.labels))
+}
+
+func (rule *AlertingRule) State() AlertState {
+	rule.mutex.Lock()
+	defer rule.mutex.Unlock()
+
+	maxState := INACTIVE
+	for _, activeAlert := range rule.activeAlerts {
+		if activeAlert.State > maxState {
+			maxState = activeAlert.State
+		}
+	}
+	return maxState
+}
+
+func (rule *AlertingRule) ActiveAlerts() []Alert {
+	rule.mutex.Lock()
+	defer rule.mutex.Unlock()
+
+	alerts := make([]Alert, 0, len(rule.activeAlerts))
+	for _, alert := range rule.activeAlerts {
+		alerts = append(alerts, *alert)
+	}
+	return alerts
 }
 
 // Construct a new AlertingRule.
@@ -158,6 +219,6 @@ func NewAlertingRule(name string, vector ast.VectorNode, holdDuration time.Durat
 		vector:       vector,
 		holdDuration: holdDuration,
 		labels:       labels,
-		activeAlerts: map[model.Fingerprint]*alert{},
+		activeAlerts: map[model.Fingerprint]*Alert{},
 	}
 }

rules/ast/printer.go

@@ -321,7 +321,12 @@ func (node *VectorFunctionCall) String() string {
 }
 
 func (node *VectorAggregation) String() string {
-	return fmt.Sprintf("%s(%s) BY (%s)", node.aggrType, node.vector, node.groupBy)
+	aggrString := fmt.Sprintf("%s(%s)", node.aggrType, node.vector)
+	if len(node.groupBy) > 0 {
+		return fmt.Sprintf("%s BY (%s)", aggrString, node.groupBy)
+	} else {
+		return aggrString
+	}
 }
 
 func (node *VectorArithExpr) String() string {

rules/helpers.go

@@ -15,6 +15,8 @@ package rules
 
 import (
 	"fmt"
+	"html"
+
 	"github.com/prometheus/prometheus/model"
 	"github.com/prometheus/prometheus/rules/ast"
 	"github.com/prometheus/prometheus/utility"
@@ -111,3 +113,7 @@ func NewMatrix(vector ast.Node, intervalStr string) (ast.MatrixNode, error) {
 	vectorLiteral := vector.(*ast.VectorLiteral)
 	return ast.NewMatrixLiteral(vectorLiteral, interval), nil
 }
+
+func ConsoleLinkForExpression(expr string) string {
+	return html.EscapeString(fmt.Sprintf(`graph#[{"expr":%q,"tab":1}]`, expr))
+}

rules/manager.go

@@ -28,9 +28,16 @@ type Result struct {
 }
 
 type RuleManager interface {
+	// Load and add rules from rule files specified in the configuration.
 	AddRulesFromConfig(config config.Config) error
+	// Start the rule manager's periodic rule evaluation.
 	Run()
+	// Stop the rule manager's rule evaluation cycles.
+	Stop()
+	// Return all rules.
 	Rules() []Rule
+	// Return all alerting rules.
+	AlertingRules() []*AlertingRule
 }
 
 type ruleManager struct {
@@ -127,3 +134,16 @@ func (m *ruleManager) Rules() []Rule {
 	copy(rules, m.rules)
 	return rules
 }
+
+func (m *ruleManager) AlertingRules() []*AlertingRule {
+	m.Lock()
+	defer m.Unlock()
+
+	alerts := []*AlertingRule{}
+	for _, rule := range m.rules {
+		if alertingRule, ok := rule.(*AlertingRule); ok {
+			alerts = append(alerts, alertingRule)
+		}
+	}
+	return alerts
+}

rules/recording.go

@@ -15,11 +15,13 @@ package rules
 
 import (
 	"fmt"
+	"html/template"
+	"time"
+
 	"github.com/prometheus/prometheus/model"
 	"github.com/prometheus/prometheus/rules/ast"
 	"github.com/prometheus/prometheus/stats"
 	"github.com/prometheus/prometheus/storage/metric"
-	"time"
 )
 
 // A RecordingRule records its vector expression into new timeseries.
@@ -71,6 +73,17 @@ func (rule RecordingRule) String() string {
 	return fmt.Sprintf("%s%s = %s\n", rule.name, rule.labels, rule.vector)
 }
 
+func (rule RecordingRule) HTMLSnippet() template.HTML {
+	ruleExpr := rule.vector.String()
+	return template.HTML(fmt.Sprintf(
+		`<a href="%s">%s</a>%s = <a href="%s">%s</a>`,
+		ConsoleLinkForExpression(rule.name),
+		rule.name,
+		rule.labels,
+		ConsoleLinkForExpression(ruleExpr),
+		ruleExpr))
+}
+
 // Construct a new RecordingRule.
 func NewRecordingRule(name string, labels model.LabelSet, vector ast.VectorNode, permanent bool) *RecordingRule {
 	return &RecordingRule{

rules/rules.go

@@ -14,9 +14,11 @@
 package rules
 
 import (
+	"html/template"
+	"time"
+
 	"github.com/prometheus/prometheus/rules/ast"
 	"github.com/prometheus/prometheus/storage/metric"
-	"time"
 )
 
 // A Rule encapsulates a vector expression which is evaluated at a specified
@@ -33,4 +35,7 @@ type Rule interface {
 	ToDotGraph() string
 	// String returns a human-readable string representation of the rule.
 	String() string
+	// HTMLSnippet returns a human-readable string representation of the rule,
+	// decorated with HTML elements for use the web frontend.
+	HTMLSnippet() template.HTML
 }

web/Makefile

@@ -13,7 +13,7 @@
 
 all: blob-stamp
 
-blob-stamp: static/generated/protocol_buffer.descriptor
+blob-stamp: static/generated/protocol_buffer.descriptor templates/*
 	$(MAKE) -C blob
 	touch $@
 

web/alerts.go

@@ -0,0 +1,61 @@
+// Copyright 2013 Prometheus Team
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package web
+
+import (
+	"github.com/prometheus/prometheus/rules"
+	"net/http"
+	"sort"
+	"sync"
+)
+
+type AlertStatus struct {
+	AlertingRules []*rules.AlertingRule
+}
+
+type AlertsHandler struct {
+	RuleManager rules.RuleManager
+
+	mutex sync.Mutex
+}
+
+type byAlertStateSorter struct {
+	alerts []*rules.AlertingRule
+}
+
+func (s byAlertStateSorter) Len() int {
+	return len(s.alerts)
+}
+
+func (s byAlertStateSorter) Less(i, j int) bool {
+	return s.alerts[i].State() > s.alerts[j].State()
+}
+
+func (s byAlertStateSorter) Swap(i, j int) {
+	s.alerts[i], s.alerts[j] = s.alerts[j], s.alerts[i]
+}
+
+func (h *AlertsHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	h.mutex.Lock()
+	defer h.mutex.Unlock()
+
+	alerts := h.RuleManager.AlertingRules()
+	alertsSorter := byAlertStateSorter{alerts: alerts}
+	sort.Sort(alertsSorter)
+
+	alertStatus := AlertStatus{
+		AlertingRules: alertsSorter.alerts,
+	}
+	executeTemplate(w, "alerts", alertStatus)
+}

web/static/css/alerts.css

@@ -0,0 +1,48 @@
+.alert_wrapper {
+  padding: 2px;
+}
+
+.alert_header {
+  padding: 3px;
+  cursor: pointer;
+}
+
+.alert_content {
+  padding: 3px;
+  display: none;
+}
+
+.alert_header.firing {
+  background-color: #ff7673;
+}
+
+.alert_header.pending {
+  background-color: #ffcf40;
+}
+
+.alert_header.inactive {
+  background-color: #92ed6b;
+}
+
+.alert_description {
+  margin-left: 3px;
+  padding: 8px 0 8px 0;
+}
+
+.alert_active_elements {
+  border: 1px solid #dddddd;
+}
+
+.alert_active_elements th {
+  background-color: #dddddd;
+  padding: 0 5px 0 5px;
+}
+
+.alert_active_elements td {
+  background-color: #eebbbb;
+  padding: 0 5px 0 5px;
+}
+
+.alert_active_elements tr:hover td {
+  background-color: #ffcf40;
+}

web/static/js/alerts.js

@@ -0,0 +1,5 @@
+function init() {
+  $(".alert_header").click(function() {$(this).next().toggle(); });
+}
+
+$(init);

web/static/js/graph.js

@@ -519,6 +519,7 @@ function parseGraphOptionsFromUrl() {
   return options;
 }
 
+// NOTE: This needs to be kept in sync with rules/helpers.go:ConsoleLinkForExpression!
 function storeGraphOptionsInUrl() {
   var allGraphsOptions = [];
   for (var i = 0; i < graphs.length; i++) {
@@ -559,4 +560,5 @@ function init() {
     }
   })
 }
+
 $(init);

web/status.go

@@ -27,7 +27,7 @@ type PrometheusStatus struct {
 	Config      string
 	Curation    metric.CurationState
 	Flags       map[string]string
-	Rules       []rules.Rule
+	RuleManager rules.RuleManager
 	TargetPools map[string]*retrieval.TargetPool
 
 	Birth time.Time

web/templates/_base.html

@@ -13,6 +13,7 @@
       <a href="/graph">Graph &amp; Console</a>
       <a href="/">Status</a>
       <a href="/databases">Databases</a>
+      <a href="/alerts">Alerts</a>
       {{ define "user_dashboard_link" }}{{ end }}
       {{ template "user_dashboard_link" .}}
 

web/templates/alerts.html

@@ -0,0 +1,41 @@
+{{define "head"}}
+    <link type="text/css" rel="stylesheet" href="/static/css/alerts.css">
+    <script src="/static/js/alerts.js"></script>
+{{end}}
+
+{{define "content"}}
+    <h2>Alerts</h2>
+    <div class="grouping_box">
+      {{range .AlertingRules}}
+      {{$activeAlerts := .ActiveAlerts}}
+      <div class="alert_wrapper">
+        <div class="alert_header {{.State}}">
+          {{.Name}} ({{len $activeAlerts}} active)
+        </div>
+        <div class="alert_content">
+          <div class="alert_description">
+            <b>Rule:</b> {{.HTMLSnippet}}
+          </div>
+          {{if $activeAlerts}}
+          <table class="alert_active_elements">
+            <tr>
+              <th>Labels</th>
+              <th>State</th>
+              <th>Active Since</th>
+              <th>Value</th>
+            </tr>
+            {{range $activeAlerts}}
+            <tr>
+              <td>{{.Labels}}</td>
+              <td>{{.State}}</td>
+              <td>{{.ActiveSince}}</td>
+              <td>{{.Value}}</td>
+            </tr>
+            {{end}}
+          </table>
+          {{end}}
+        </div>
+      </div>
+      {{end}}
+    </div>
+{{end}}

web/templates/databases.html

@@ -1,8 +1,8 @@
 {{define "head"}}<!-- nix -->{{end}}
 
 {{define "content"}}
-    <div class="grouping_box">
     <h2>Database Information</h2>
+    <div class="grouping_box">
     {{range .States}}
     <div class="grouping_box">
     <h3>{{.Name}}</h3>

web/templates/graph.html

@@ -2,7 +2,6 @@
     <script src="/static/vendor/jqueryui/jquery-ui.min.js"></script>
     <link rel="stylesheet" href="/static/vendor/jqueryui/themes/base/jquery-ui.css" />
 
-    <link type="text/css" rel="stylesheet" href="/static/css/prometheus.css">
     <link type="text/css" rel="stylesheet" href="/static/css/graph.css">
 
     <script src="/static/vendor/jquery-simple-datetimepicker/jquery.simple-dtpicker.js"></script>

web/templates/status.html

@@ -35,7 +35,7 @@
 
     <h2>Rules</h2>
     <div class="grouping_box">
-    <pre>{{range .Rules}}{{.String}}{{end}}</pre>
+    <pre>{{range .RuleManager.Rules}}{{.HTMLSnippet}}<br/>{{end}}</pre>
     </div>
 
     <h2>Targets</h2>

web/web.go

@@ -38,6 +38,7 @@ type WebService struct {
 	StatusHandler    *StatusHandler
 	DatabasesHandler *DatabasesHandler
 	MetricsHandler   *api.MetricsService
+	AlertsHandler    *AlertsHandler
 }
 
 func (w WebService) ServeForever() error {
@@ -56,6 +57,7 @@ func (w WebService) ServeForever() error {
 
 	exp.Handle("/", w.StatusHandler)
 	exp.Handle("/databases", w.DatabasesHandler)
+	exp.Handle("/alerts", w.AlertsHandler)
 	exp.HandleFunc("/graph", graphHandler)
 
 	exp.Handle("/api/", gorest.Handle())