Added VerbLower to have lowercase verbs

internal/alerts/help.go

@@ -9,7 +9,7 @@ package alerts
 func TemplateVarsHint() string {
 	return "Go text/template — leave empty to use the built-in format.\n" +
 		"  Vars: {{.Check.Name}}, {{.Check.Target}}, {{.Check.Type}}, {{.Check.ID}},\n" +
-		"        {{.Verb}} (UP|DOWN|RECOVERED), {{.From}}, {{.To}}, {{.NodeID}}, {{.When}},\n" +
+		"        {{.Verb}} (UP|DOWN|RECOVERED), {{.VerbLower}}, {{.From}}, {{.To}}, {{.NodeID}}, {{.When}},\n" +
 		"        {{.Snapshot.Detail}}, {{.Snapshot.Reports}}, {{.Snapshot.OKCount}}, {{.Snapshot.NotOK}}"
 }
 
@@ -29,6 +29,7 @@ Available variables:
   {{.Check.Type}}        http | tcp | icmp
   {{.Check.ID}}          stable check UUID
   {{.Verb}}              UP | DOWN | RECOVERED
+  {{.VerbLower}}         lowercase form of Verb (up | down | recovered)
   {{.From}}              previous state name
   {{.To}}                new state name
   {{.NodeID}}            master node that rendered the message

internal/alerts/message.go

@@ -22,6 +22,7 @@ type TemplateContext struct {
 	From     string          // previous state name
 	To       string          // new state name
 	Verb     string          // "UP" | "DOWN" | "RECOVERED"
+	VerbLower string         // lowercase form of Verb ("up" | "down" | "recovered")
 	Snapshot checks.Snapshot // aggregate counts and detail
 	NodeID   string          // master that rendered the message
 	When     string          // RFC3339 timestamp
@@ -88,14 +89,16 @@ func RenderFor(alert *config.Alert, nodeID string, check *config.Check, from, to
 }
 
 func newContext(nodeID string, check *config.Check, from, to checks.State, snap checks.Snapshot) TemplateContext {
+	verb := transitionVerb(from, to)
 	return TemplateContext{
-		Check:    check,
-		From:     string(from),
-		To:       string(to),
-		Verb:     transitionVerb(from, to),
-		Snapshot: snap,
-		NodeID:   nodeID,
-		When:     time.Now().UTC().Format(time.RFC3339),
+		Check:     check,
+		From:      string(from),
+		To:        string(to),
+		Verb:      verb,
+		VerbLower: strings.ToLower(verb),
+		Snapshot:  snap,
+		NodeID:    nodeID,
+		When:      time.Now().UTC().Format(time.RFC3339),
 	}
 }