Add prowl to list of methods checked for enablement of notifications (#6022)

health/notifications/alarm-notify.sh.in

@@ -654,6 +654,7 @@ for method in "${SEND_EMAIL}" \
 	"${SEND_KAFKA}" \
 	"${SEND_PD}" \
 	"${SEND_FLEEP}" \
+	"${SEND_PROWL}" \
 	"${SEND_CUSTOM}" \
 	"${SEND_IRC}" \
 	"${SEND_AWSSNS}" \