support drain/undrain feature server from cluster

lib/utils/install-srf-locals.js

@@ -71,7 +71,7 @@ function installSrfLocals(srf, logger, {
   logger.debug('installing srf locals');
   assert(!srf.locals.dbHelpers);
   const {tracer} = srf.locals.otel;
-  const {getSBC, lifecycleEmitter} = require('./sbc-pinger')(logger);
+  const {getSBC, lifecycleEmitter, setDryUpCalls, clearDryUpCalls} = require('./sbc-pinger')(logger);
   const StatsCollector = require('@jambonz/stats-collector');
   const stats = srf.locals.stats = new StatsCollector(logger);
 
@@ -285,6 +285,8 @@ function installSrfLocals(srf, logger, {
     },
     parentLogger: logger,
     getSBC,
+    setDryUpCalls,
+    clearDryUpCalls,
     getSmpp: () => {
       return SMPP_URL;
     },