Added external URL access

Signed-off-by: Levi Harrison <git@leviharrison.dev>

cmd/prometheus/main.go

@@ -527,6 +527,9 @@ func main() {
 		conntrack.DialWithTracing(),
 	)
 
+	// This is passed to ruleManager.Update().
+	var externalURL = cfg.web.ExternalURL.String()
+
 	reloaders := []reloader{
 		{
 			name:     "remote_storage",
@@ -592,6 +595,7 @@ func main() {
 					time.Duration(cfg.GlobalConfig.EvaluationInterval),
 					files,
 					cfg.GlobalConfig.ExternalLabels,
+					externalURL,
 				)
 			},
 		},

cmd/promtool/rules.go

@@ -68,7 +68,7 @@ func newRuleImporter(logger log.Logger, config ruleImporterConfig, apiClient que
 
 // loadGroups parses groups from a list of recording rule files.
 func (importer *ruleImporter) loadGroups(ctx context.Context, filenames []string) (errs []error) {
-	groups, errs := importer.ruleManager.LoadGroups(importer.config.evalInterval, labels.Labels{}, filenames...)
+	groups, errs := importer.ruleManager.LoadGroups(importer.config.evalInterval, labels.Labels{}, "", filenames...)
 	if errs != nil {
 		return errs
 	}

cmd/promtool/unittest.go

@@ -146,6 +146,7 @@ type testGroup struct {
 	AlertRuleTests  []alertTestCase  `yaml:"alert_rule_test,omitempty"`
 	PromqlExprTests []promqlTestCase `yaml:"promql_expr_test,omitempty"`
 	ExternalLabels  labels.Labels    `yaml:"external_labels,omitempty"`
+	ExternalURL     string           `yaml:"external_url,omitempty"`
 	TestGroupName   string           `yaml:"name,omitempty"`
 }
 
@@ -168,7 +169,7 @@ func (tg *testGroup) test(evalInterval time.Duration, groupOrderMap map[string]i
 		Logger:     log.NewNopLogger(),
 	}
 	m := rules.NewManager(opts)
-	groupsMap, ers := m.LoadGroups(time.Duration(tg.Interval), tg.ExternalLabels, ruleFiles...)
+	groupsMap, ers := m.LoadGroups(time.Duration(tg.Interval), tg.ExternalLabels, tg.ExternalURL, ruleFiles...)
 	if ers != nil {
 		return ers
 	}

pkg/rulefmt/rulefmt.go

@@ -223,10 +223,11 @@ func testTemplateParsing(rl *RuleNode) (errs []error) {
 	}
 
 	// Trying to parse templates.
-	tmplData := template.AlertTemplateData(map[string]string{}, map[string]string{}, 0)
+	tmplData := template.AlertTemplateData(map[string]string{}, map[string]string{}, "", 0)
 	defs := []string{
 		"{{$labels := .Labels}}",
 		"{{$externalLabels := .ExternalLabels}}",
+		"{{$externalURL := .ExternalURL}}",
 		"{{$value := .Value}}",
 	}
 	parseTest := func(text string) error {

rules/alerting.go

@@ -121,6 +121,8 @@ type AlertingRule struct {
 	annotations labels.Labels
 	// External labels from the global config.
 	externalLabels map[string]string
+	// The external URL from the --web.external-url flag.
+	externalURL string
 	// true if old state has been restored. We start persisting samples for ALERT_FOR_STATE
 	// only after the restoration.
 	restored bool
@@ -144,7 +146,7 @@ type AlertingRule struct {
 // NewAlertingRule constructs a new AlertingRule.
 func NewAlertingRule(
 	name string, vec parser.Expr, hold time.Duration,
-	labels, annotations, externalLabels labels.Labels,
+	labels, annotations, externalLabels labels.Labels, externalURL string,
 	restored bool, logger log.Logger,
 ) *AlertingRule {
 	el := make(map[string]string, len(externalLabels))
@@ -159,6 +161,7 @@ func NewAlertingRule(
 		labels:         labels,
 		annotations:    annotations,
 		externalLabels: el,
+		externalURL:    externalURL,
 		health:         HealthUnknown,
 		active:         map[uint64]*Alert{},
 		logger:         logger,
@@ -318,12 +321,13 @@ func (r *AlertingRule) Eval(ctx context.Context, ts time.Time, query QueryFunc,
 			l[lbl.Name] = lbl.Value
 		}
 
-		tmplData := template.AlertTemplateData(l, r.externalLabels, smpl.V)
+		tmplData := template.AlertTemplateData(l, r.externalLabels, r.externalURL, smpl.V)
 		// Inject some convenience variables that are easier to remember for users
 		// who are not used to Go's templating system.
 		defs := []string{
 			"{{$labels := .Labels}}",
 			"{{$externalLabels := .ExternalLabels}}",
+			"{{$externalURL := .ExternalURL}}",
 			"{{$value := .Value}}",
 		}
 

rules/manager.go

@@ -946,11 +946,11 @@ func (m *Manager) Stop() {
 
 // Update the rule manager's state as the config requires. If
 // loading the new rules failed the old rule set is restored.
-func (m *Manager) Update(interval time.Duration, files []string, externalLabels labels.Labels) error {
+func (m *Manager) Update(interval time.Duration, files []string, externalLabels labels.Labels, externalURL string) error {
 	m.mtx.Lock()
 	defer m.mtx.Unlock()
 
-	groups, errs := m.LoadGroups(interval, externalLabels, files...)
+	groups, errs := m.LoadGroups(interval, externalLabels, externalURL, files...)
 	if errs != nil {
 		for _, e := range errs {
 			level.Error(m.logger).Log("msg", "loading groups failed", "err", e)
@@ -1034,7 +1034,7 @@ func (FileLoader) Parse(query string) (parser.Expr, error) { return parser.Parse
 
 // LoadGroups reads groups from a list of files.
 func (m *Manager) LoadGroups(
-	interval time.Duration, externalLabels labels.Labels, filenames ...string,
+	interval time.Duration, externalLabels labels.Labels, externalURL string, filenames ...string,
 ) (map[string]*Group, []error) {
 	groups := make(map[string]*Group)
 
@@ -1067,6 +1067,7 @@ func (m *Manager) LoadGroups(
 						labels.FromMap(r.Labels),
 						labels.FromMap(r.Annotations),
 						externalLabels,
+						externalURL,
 						m.restored,
 						log.With(m.logger, "alert", r.Alert),
 					))

template/template.go

@@ -295,14 +295,16 @@ func NewTemplateExpander(
 }
 
 // AlertTemplateData returns the interface to be used in expanding the template.
-func AlertTemplateData(labels map[string]string, externalLabels map[string]string, value float64) interface{} {
+func AlertTemplateData(labels map[string]string, externalLabels map[string]string, externalURL string, value float64) interface{} {
 	return struct {
 		Labels         map[string]string
 		ExternalLabels map[string]string
+		ExternalURL    string
 		Value          float64
 	}{
 		Labels:         labels,
 		ExternalLabels: externalLabels,
+		ExternalURL:    externalURL,
 		Value:          value,
 	}
 }