chore(rule-engine): Dump events in rule matches

When the rule is fired, besides including alert name and text, the list of all events that
triggered the alert are also included in the log message.

pkg/filter/action/emit.go

@@ -25,11 +25,17 @@ import (
 	"github.com/rabbitstack/fibratus/pkg/config"
 	"github.com/rabbitstack/fibratus/pkg/util/markdown"
 	log "github.com/sirupsen/logrus"
+	"strings"
 )
 
 // Emit sends the rule alert via all configured alert senders.
 func Emit(ctx *config.ActionContext, title string, text string, severity string, tags []string) error {
-	log.Infof("sending alert: [%s]. Text: %s", title, text)
+	var b strings.Builder
+	for _, evt := range ctx.Events {
+		b.WriteString(evt.String())
+		b.WriteByte('\n')
+	}
+	log.Infof("sending alert: [%s]. Text: %s Event(s): %s", title, text, b.String())
 
 	senders := alertsender.FindAll()
 	if len(senders) == 0 {