diff --git a/envoy/1.20/patches/envoy/20240726-custom-span-tag.patch b/envoy/1.20/patches/envoy/20240726-custom-span-tag.patch
new file mode 100644
index 000000000..85ee540d4
--- /dev/null
+++ b/envoy/1.20/patches/envoy/20240726-custom-span-tag.patch
@@ -0,0 +1,106 @@
+diff --git a/envoy/stream_info/stream_info.h b/envoy/stream_info/stream_info.h
+index c6d82db4f4..09717673b0 100644
+--- a/envoy/stream_info/stream_info.h
++++ b/envoy/stream_info/stream_info.h
+@@ -613,7 +613,21 @@ public:
+    * @return the number of times the request was attempted upstream, absl::nullopt if the request
+    * was never attempted upstream.
+    */
++
+   virtual absl::optional<uint32_t> attemptCount() const PURE;
++
++#ifdef ALIMESH
++  /**
++   * @param key the filter state key set by wasm filter.
++   * @param value the filter state value set by wasm filter.
++   */
++  virtual void setCustomSpanTag(const std::string& key, const std::string& value) PURE;
++
++  /**
++   * @return the key-value map of filter states set by wasm filter.
++   */
++  virtual const std::unordered_map<std::string, std::string>& getCustomSpanTagMap() const PURE;
++#endif
+ };
+ 
+ } // namespace StreamInfo
+diff --git a/source/common/stream_info/stream_info_impl.h b/source/common/stream_info/stream_info_impl.h
+index 6ce2afe773..d5e7a80b37 100644
+--- a/source/common/stream_info/stream_info_impl.h
++++ b/source/common/stream_info/stream_info_impl.h
+@@ -291,6 +291,20 @@ struct StreamInfoImpl : public StreamInfo {
+ 
+   absl::optional<uint32_t> attemptCount() const override { return attempt_count_; }
+ 
++#ifdef ALIMESH
++  void setCustomSpanTag(const std::string& key, const std::string& value) override {
++    auto it = custom_span_tags_.find(key);
++    if (it != custom_span_tags_.end()) {
++      it->second = value;
++    } else {
++      custom_span_tags_.emplace(key, value);
++    }
++  }
++
++  const std::unordered_map<std::string, std::string>& getCustomSpanTagMap() const override {
++    return custom_span_tags_;
++  }
++#endif
+   TimeSource& time_source_;
+   const SystemTime start_time_;
+   const MonotonicTime start_time_monotonic_;
+@@ -350,6 +364,9 @@ private:
+   absl::optional<Upstream::ClusterInfoConstSharedPtr> upstream_cluster_info_;
+   std::string filter_chain_name_;
+   Tracing::Reason trace_reason_;
++#ifdef ALIMESH
++  std::unordered_map<std::string, std::string> custom_span_tags_;
++#endif
+ };
+ 
+ } // namespace StreamInfo
+diff --git a/source/common/tracing/http_tracer_impl.cc b/source/common/tracing/http_tracer_impl.cc
+index e55cf00e0a..f94e9101d7 100644
+--- a/source/common/tracing/http_tracer_impl.cc
++++ b/source/common/tracing/http_tracer_impl.cc
+@@ -214,6 +214,14 @@ void HttpTracerUtility::setCommonTags(Span& span, const Http::ResponseHeaderMap*
+ 
+   span.setTag(Tracing::Tags::get().Component, Tracing::Tags::get().Proxy);
+ 
++#ifdef ALIMESH
++  // Wasm filter state
++  const auto& custom_span_tags = stream_info.getCustomSpanTagMap();
++  for (const auto& it : custom_span_tags) {
++    span.setTag(it.first, it.second);
++  }
++#endif
++
+   if (nullptr != stream_info.upstreamHost()) {
+     span.setTag(Tracing::Tags::get().UpstreamCluster, stream_info.upstreamHost()->cluster().name());
+     span.setTag(Tracing::Tags::get().UpstreamClusterName,
+diff --git a/source/extensions/common/wasm/context.cc b/source/extensions/common/wasm/context.cc
+index 410baa856f..b11ecf1cd6 100644
+--- a/source/extensions/common/wasm/context.cc
++++ b/source/extensions/common/wasm/context.cc
+@@ -60,6 +60,7 @@ namespace {
+ constexpr absl::string_view CelStateKeyPrefix = "wasm.";
+ 
+ #if defined(ALIMESH)
++constexpr absl::string_view CustomeTraceSpanTagPrefix = "trace_span_tag.";
+ constexpr std::string_view ClearRouteCacheKey = "clear_route_cache";
+ constexpr std::string_view DisableClearRouteCache = "off";
+ constexpr std::string_view SetDecoderBufferLimit = "set_decoder_buffer_limit";
+@@ -1271,6 +1272,13 @@ WasmResult Context::setProperty(std::string_view path, std::string_view value) {
+   if (!stream_info) {
+     return WasmResult::NotFound;
+   }
++#ifdef ALIMESH
++  if (absl::StartsWith(absl::string_view{path.data(), path.size()}, CustomeTraceSpanTagPrefix)) {
++    stream_info->setCustomSpanTag(std::string(path.substr(CustomeTraceSpanTagPrefix.size())),
++                                  std::string(value));
++    return WasmResult::Ok;
++  }
++#endif
+   std::string key;
+   absl::StrAppend(&key, CelStateKeyPrefix, toAbslStringView(path));
+   CelState* state;