fix: improve least_conn balancer implementation

Author: coder2z

apisix/cli/config.lua

@@ -97,6 +97,7 @@ local _M = {
         ["prometheus-metrics"] = "15m",
         ["standalone-config"] = "10m",
         ["status-report"] = "1m",
+        ["balancer-least-conn"] = "10m",
       }
     },
     stream = {

apisix/cli/ngx_tpl.lua

@@ -73,6 +73,9 @@ lua {
     {% if status then %}
     lua_shared_dict status-report {* meta.lua_shared_dict["status-report"] *};
     {% end %}
+    {% if enable_stream then %}
+    lua_shared_dict balancer-least-conn {* meta.lua_shared_dict["balancer-least-conn"] *};
+    {% end %}
 }
 
 {% if enabled_stream_plugins["prometheus"] and not enable_http then %}
@@ -284,7 +287,9 @@ http {
     lua_shared_dict balancer-ewma {* http.lua_shared_dict["balancer-ewma"] *};
     lua_shared_dict balancer-ewma-locks {* http.lua_shared_dict["balancer-ewma-locks"] *};
     lua_shared_dict balancer-ewma-last-touched-at {* http.lua_shared_dict["balancer-ewma-last-touched-at"] *};
+    {% if not enable_stream then %}
     lua_shared_dict balancer-least-conn {* http.lua_shared_dict["balancer-least-conn"] *};
+    {% end %}
     lua_shared_dict etcd-cluster-health-check {* http.lua_shared_dict["etcd-cluster-health-check"] *}; # etcd health check
 
     # for discovery shared dict