bugfix: set canary attributes when initializing balancer

rootfs/etc/nginx/lua/balancer/chash.lua

@@ -9,6 +9,8 @@ function _M.new(self, backend)
   local o = {
     instance = self.factory:new(nodes),
     hash_by = backend["upstream-hash-by"],
+    traffic_shaping_policy = backend.trafficShapingPolicy,
+    alternative_backends = backend.alternativeBackends,
   }
   setmetatable(o, self)
   self.__index = self

rootfs/etc/nginx/lua/balancer/ewma.lua

@@ -120,6 +120,8 @@ end
 function _M.new(self, backend)
   local o = {
     peers = backend.endpoints,
+    traffic_shaping_policy = backend.trafficShapingPolicy,
+    alternative_backends = backend.alternativeBackends,
   }
   setmetatable(o, self)
   self.__index = self

rootfs/etc/nginx/lua/balancer/round_robin.lua

@@ -8,6 +8,8 @@ function _M.new(self, backend)
   local nodes = util.get_nodes(backend.endpoints)
   local o = {
     instance = self.factory:new(nodes),
+    traffic_shaping_policy = backend.trafficShapingPolicy,
+    alternative_backends = backend.alternativeBackends,
   }
   setmetatable(o, self)
   self.__index = self

rootfs/etc/nginx/lua/balancer/sticky.lua

@@ -18,6 +18,8 @@ function _M.new(self, backend)
     cookie_expires = backend["sessionAffinityConfig"]["cookieSessionAffinity"]["expires"],
     cookie_max_age = backend["sessionAffinityConfig"]["cookieSessionAffinity"]["maxage"],
     digest_func = digest_func,
+    traffic_shaping_policy = backend.trafficShapingPolicy,
+    alternative_backends = backend.alternativeBackends,
   }
   setmetatable(o, self)
   self.__index = self