feat: raise default sizes for non-evictable shared dicts

The prometheus-metrics, service-discovery, and tracing shared dicts
reject writes and drop data when full, with no self-healing eviction.
Their previous defaults overflow on medium and large deployments,
causing silently missing metrics, unresolved upstream nodes, or lost
trace spans that are hard to diagnose.

Raise the defaults so a typical deployment works without manual tuning:

- prometheus-metrics: 15m/10m -> 256m
- kubernetes / consul discovery shared_size: 1m -> 64m
- nacos / nacos-stream discovery: 10m -> 64m
- tracing_buffer: 10m -> 32m

An explicit size in config.yaml (or a discovery config's shared_size)
always overrides the default, so deployments that already tune these
are unaffected.

Signed-off-by: Nic <qianyong@api7.ai>

Author: nic-6443

apisix/cli/config.lua

@@ -103,7 +103,7 @@ local _M = {
     },
     meta = {
       lua_shared_dict = {
-        ["prometheus-metrics"] = "15m",
+        ["prometheus-metrics"] = "256m",
         ["prometheus-cache"] = "10m",
         ["standalone-config"] = "10m",
         ["status-report"] = "1m",
@@ -162,7 +162,7 @@ local _M = {
         ["internal-status"] = "10m",
         ["plugin-limit-req"] = "10m",
         ["plugin-limit-count"] = "10m",
-        ["prometheus-metrics"] = "10m",
+        ["prometheus-metrics"] = "256m",
         ["plugin-limit-conn"] = "10m",
         ["worker-events"] = "10m",
         ["lrucache-lock"] = "10m",
@@ -177,7 +177,7 @@ local _M = {
         ["plugin-graphql-limit-count-reset-header"] = "10m",
         ["plugin-ai-rate-limiting"] = "10m",
         ["plugin-ai-rate-limiting-reset-header"] = "10m",
-        tracing_buffer = "10m",
+        tracing_buffer = "32m",
         ["plugin-api-breaker"] = "10m",
         ["etcd-cluster-health-check"] = "10m",
         discovery = "1m",

apisix/cli/ngx_tpl.lua

@@ -77,7 +77,7 @@ lua {
     {% if status then %}
     lua_shared_dict status-report {* meta.lua_shared_dict["status-report"] *};
     {% end %}
-    lua_shared_dict nacos 10m;
+    lua_shared_dict nacos 64m;
     lua_shared_dict upstream-healthcheck {* meta.lua_shared_dict["upstream-healthcheck"] *};
 }
 
@@ -149,7 +149,7 @@ stream {
     lua_shared_dict lrucache-lock-stream {* stream.lua_shared_dict["lrucache-lock-stream"] *};
     lua_shared_dict etcd-cluster-health-check-stream {* stream.lua_shared_dict["etcd-cluster-health-check-stream"] *};
     lua_shared_dict worker-events-stream {* stream.lua_shared_dict["worker-events-stream"] *};
-    lua_shared_dict nacos-stream 10m;
+    lua_shared_dict nacos-stream 64m;
 
     {% if enabled_discoveries["tars"] then %}
     lua_shared_dict tars-stream {* stream.lua_shared_dict["tars-stream"] *};

apisix/cli/ops.lua

@@ -908,7 +908,7 @@ Please modify "admin_key" in conf/config.yaml .
         end
 
         local consul_conf = yaml_conf.discovery["consul"]
-        sys_conf["discovery_shared_dicts"]["consul"] = consul_conf.shared_size or "10m"
+        sys_conf["discovery_shared_dicts"]["consul"] = consul_conf.shared_size or "64m"
     end
 
     -- fix up lua path

apisix/discovery/consul/schema.lua

@@ -27,7 +27,7 @@ return {
         shared_size = {
             type = "string",
             pattern = [[^[1-9][0-9]*m$]],
-            default = "1m",
+            default = "64m",
         },
         token = {type = "string", default = ""},
         fetch_interval = {type = "integer", minimum = 1, default = 3},

apisix/discovery/kubernetes/schema.lua

@@ -102,7 +102,7 @@ local default_weight_schema = {
 local shared_size_schema = {
     type = "string",
     pattern = [[^[1-9][0-9]*m$]],
-    default = "1m",
+    default = "64m",
 }
 
 local watch_endpoint_slices_schema = {

docs/en/latest/discovery/kubernetes.md

@@ -90,7 +90,7 @@ discovery:
       first="a",second="b"
 
     # reserved lua shared memory size,1m memory can store about 1000 pieces of endpoint
-    shared_size: 1m #default 1m
+    shared_size: 64m #default 64m
 
     # if watch_endpoint_slices setting true, watch apiserver with endpointslices instead of endpoints
     watch_endpoint_slices: false #default false
@@ -222,7 +222,7 @@ discovery:
       first="a",second="b"
 
     # reserved lua shared memory size,1m memory can store about 1000 pieces of endpoint
-    shared_size: 1m #default 1m
+    shared_size: 64m #default 64m
 
     # if watch_endpoint_slices setting true, watch apiserver with endpointslices instead of endpoints
     watch_endpoint_slices: false #default false
@@ -402,7 +402,7 @@ Which will yield the following response:
         "port": "6443",
         "schema": "https"
       },
-      "shared_size": "1m"
+      "shared_size": "64m"
     }
   ]
 }

docs/zh/latest/discovery/kubernetes.md

@@ -90,7 +90,7 @@ discovery:
       first="a",second="b"
 
     # reserved lua shared memory size, 1m memory can store about 1000 pieces of endpoint
-    shared_size: 1m #default 1m
+    shared_size: 64m #default 64m
 
     # if watch_endpoint_slices setting true, watch apiserver with endpointslices instead of endpoints
     watch_endpoint_slices: false #default false
@@ -221,7 +221,7 @@ discovery:
       first="a",second="b"
 
     # reserved lua shared memory size,1m memory can store about 1000 pieces of endpoint
-    shared_size: 1m #default 1m
+    shared_size: 64m #default 64m
 
     # if watch_endpoint_slices setting true, watch apiserver with endpointslices instead of endpoints
     watch_endpoint_slices: false #default false
@@ -399,7 +399,7 @@ GET /v1/discovery/kubernetes/dump
         "port": "6443",
         "schema": "https"
       },
-      "shared_size": "1m"
+      "shared_size": "64m"
     }
   ]
 }

t/cli/test_kubernetes.sh

@@ -45,7 +45,7 @@ if ! grep "env TOKEN_ENV" conf/nginx.conf; then
   exit 1
 fi
 
-if ! grep "lua_shared_dict kubernetes 1m;" conf/nginx.conf; then
+if ! grep "lua_shared_dict kubernetes 64m;" conf/nginx.conf; then
   echo "kubernetes discovery lua_shared_dict inject failed"
   exit 1
 fi
@@ -100,7 +100,7 @@ if ! grep "env PRO_TOKEN" conf/nginx.conf; then
   exit 1
 fi
 
-if ! grep "lua_shared_dict kubernetes-dev 1m;" conf/nginx.conf; then
+if ! grep "lua_shared_dict kubernetes-dev 64m;" conf/nginx.conf; then
   echo "kubernetes discovery lua_shared_dict inject failed"
   exit 1
 fi

t/kubernetes/discovery/kubernetes.t

@@ -144,7 +144,7 @@ GET /compare
     "token": "${KUBERNETES_CLIENT_TOKEN}"
   },
   "watch_endpoint_slices": false,
-  "shared_size": "1m",
+  "shared_size": "64m",
   "default_weight": 50
 }
 --- more_headers
@@ -179,7 +179,7 @@ GET /compare
     "token": "${KUBERNETES_CLIENT_TOKEN}"
   },
   "watch_endpoint_slices": false,
-  "shared_size": "1m",
+  "shared_size": "64m",
   "default_weight": 50
 }
 --- more_headers
@@ -251,7 +251,7 @@ GET /compare
     "token": "${KUBERNETES_CLIENT_TOKEN}"
   },
   "watch_endpoint_slices": false,
-  "shared_size": "1m",
+  "shared_size": "64m",
   "default_weight": 33
 }
 --- more_headers
@@ -304,7 +304,7 @@ GET /compare
     },
     "watch_endpoint_slices": false,
     "default_weight": 50,
-    "shared_size": "1m"
+    "shared_size": "64m"
   },
   {
     "id": "release",
@@ -354,7 +354,7 @@ GET /compare
     "token": "${KUBERNETES_CLIENT_TOKEN}"
   },
   "watch_endpoint_slices": true,
-  "shared_size": "1m",
+  "shared_size": "64m",
   "default_weight": 33
 }
 --- more_headers