Feat/884: Capture system_alert when feature-server is online or offline (#950)

* writing alerts during startup and shutdown of feature-server

* feat/884: created constants for system component name and state

* feat/88: added 0.2.11 version of time-series

* feat/884: renamed constant, and added GracefulShutdownInProgress system alert

lib/utils/install-srf-locals.js

@@ -199,7 +199,8 @@ function installSrfLocals(srf, logger) {
   } = require('@jambonz/speech-utils')({}, logger);
   const {
     writeAlerts,
-    AlertType
+    AlertType,
+    writeSystemAlerts
   } = require('@jambonz/time-series')(logger, {
     host: JAMBONES_TIME_SERIES_HOST,
     commitSize: 50,
@@ -269,7 +270,8 @@ function installSrfLocals(srf, logger) {
     getFreeswitch,
     stats: stats,
     writeAlerts,
-    AlertType
+    AlertType,
+    writeSystemAlerts
   };
 
   if (localIp) {