diff --git a/Dockerfile b/Dockerfile
index 13a22f18f..8b09023c7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -68,12 +68,12 @@ RUN mkdir /tmp/openssl && cd /tmp/openssl && \
     cd ~ && rm -rf /tmp/openssl
 
 # curl
-RUN git clone --depth=1 -b curl-7_69_1 https://github.com/curl/curl.git /tmp/curl && \
+RUN git clone --depth=1 -b curl-8_10_1 https://github.com/curl/curl.git /tmp/curl && \
     cd /tmp/curl && \
     ./buildconf && \
     ./configure --disable-ldap --disable-shared --without-libssh2 \
                 --without-librtmp --without-libidn --enable-static \
-                --without-libidn2 \
+                --without-libidn2 --without-libpsl \
                 --with-pic --with-ssl=/usr/local/ssl/ && \
     make -j && make install && \
     cd ~ && rm -rf /tmp/curl
diff --git a/Dockerfile.alpine b/Dockerfile.alpine
index fd9aa5283..90fcd9dff 100644
--- a/Dockerfile.alpine
+++ b/Dockerfile.alpine
@@ -53,12 +53,12 @@ RUN mkdir /tmp/openssl && cd /tmp/openssl && \
     cd ~ && rm -rf /tmp/openssl
 
 # curl
-RUN git clone --depth=1 -b curl-7_69_1 https://github.com/curl/curl.git /tmp/curl && \
+RUN git clone --depth=1 -b curl-8_10_1 https://github.com/curl/curl.git /tmp/curl && \
     cd /tmp/curl && \
     ./buildconf && \
     ./configure --disable-ldap --disable-shared --without-libssh2 \
                 --without-librtmp --without-libidn --enable-static \
-                --without-libidn2 \
+                --without-libidn2 --without-libpsl \
                 --with-pic --with-ssl=/usr/local/ssl/ && \
     make -j && make install && \
     cd ~ && rm -rf /tmp/curl
diff --git a/src/throttler_api.cc b/src/throttler_api.cc
index 0e0245588..80f70ce95 100644
--- a/src/throttler_api.cc
+++ b/src/throttler_api.cc
@@ -16,12 +16,17 @@
 
 #include <grpc/grpc_security.h>
 #include <grpc/support/string_util.h>
+#include <grpcpp/client_context.h>
 #include <grpcpp/create_channel.h>
 #include <grpcpp/security/credentials.h>
 #include <grpcpp/support/channel_arguments.h>
+#include <grpcpp/support/status.h>
 
 #include <algorithm>
 #include <chrono>  // NOLINT
+#include <cstddef>
+#include <cstdint>
+#include <ctime>
 #include <map>
 #include <memory>
 #include <mutex>
@@ -36,6 +41,7 @@
 #include "src/globals.h"
 #include "src/pem_roots.h"
 #include "src/string.h"
+#include "src/throttler.h"
 #include "google/devtools/cloudprofiler/v2/profiler.grpc.pb.h"
 #include "google/protobuf/duration.pb.h"  // NOLINT
 #include "google/rpc/error_details.pb.h"  // NOLINT
@@ -76,6 +82,7 @@ const char kServiceVersionLabel[] = "version";
 // Range of random number
 const int64_t kRandomRange = 65536;
 
+#ifdef STANDALONE_BUILD
 // Routes GRPC logging through cloud profiler logger.
 // Otherwise GRPC would log to stderr.
 void GRPCLog(gpr_log_func_args* args) {
@@ -93,6 +100,7 @@ void GRPCLog(gpr_log_func_args* args) {
                  << args->message;
   }
 }
+#endif  // STANDALONE_BUILD
 
 // Overrides the default SSL roots. Otherwise gRPC calls would fail if a SSL
 // roots file can't be found neither at a location specified by
@@ -285,7 +293,9 @@ APIThrottler::APIThrottler(
   // GRPCLog is equivalent to what gRPC is doing internally, it would be safe to
   // delete this line and the entire GRPCLog function when you upgrade gRPC to
   // version 1.65 or later.
+#ifdef STANDALONE_BUILD
   gpr_set_log_function(GRPCLog);
+#endif  // STANDALONE_BUILD
 
   // Create a random number generator.
   gen_ = std::default_random_engine(clock_->Now().tv_nsec / 1000);
diff --git a/src/throttler_api.h b/src/throttler_api.h
index 9083beb3f..dcf24befd 100644
--- a/src/throttler_api.h
+++ b/src/throttler_api.h
@@ -17,9 +17,13 @@
 #ifndef CLOUD_PROFILER_AGENT_JAVA_THROTTLER_API_H_
 #define CLOUD_PROFILER_AGENT_JAVA_THROTTLER_API_H_
 
+#include <grpcpp/client_context.h>
+#include <grpcpp/support/status.h>
 #include <jni.h>
 
 #include <atomic>
+#include <cstdint>
+#include <ctime>
 #include <memory>
 #include <mutex>  // NOLINT
 #include <random>
diff --git a/third_party/perftools/profiles/proto/builder.cc b/third_party/perftools/profiles/proto/builder.cc
index 5572f8e6f..a9c5084fb 100644
--- a/third_party/perftools/profiles/proto/builder.cc
+++ b/third_party/perftools/profiles/proto/builder.cc
@@ -71,7 +71,10 @@ int64_t Builder::StringId(const char *str) {
   if (str == nullptr || !str[0]) {
     return 0;
   }
+  return InternalStringId(str);
+}
 
+int64_t Builder::InternalStringId(const std::string &str) {
   const int64_t index = profile_->string_table_size();
   const auto inserted = strings_.emplace(str, index);
   if (!inserted.second) {
@@ -108,6 +111,22 @@ uint64_t Builder::FunctionId(const char *name, const char *system_name,
   return index;
 }
 
+void Builder::SetDocURL(const std::string &url) {
+  const std::string kHttp = "http://";
+  const std::string kHttps = "https://";
+
+  if (!url.empty() && url.compare(0, kHttp.size(), kHttp) != 0 &&
+      url.compare(0, kHttps.size(), kHttps) != 0) {
+    if (error_.empty()) {
+      error_ = "setting invalid profile doc URL '";
+      error_.append(url);
+      error_.append("'");
+    }
+    return;
+  }
+  profile_->set_doc_url(InternalStringId(url));
+}
+
 bool Builder::Emit(std::string *output) {
   *output = "";
   if (!profile_ || !Finalize()) {
@@ -265,6 +284,11 @@ bool Builder::CheckValid(const Profile &profile) {
 // - Creates missing locations for unsymbolized profiles.
 // - Associates locations to the corresponding mappings.
 bool Builder::Finalize() {
+  if (!error_.empty()) {
+    // We really should be returning an absl::Status instead of logging here.
+    LOG(ERROR) << error_;
+    return false;
+  }
   if (profile_->location_size() == 0) {
     IndexMap address_to_id;
     address_to_id.reserve(profile_->sample_size());
diff --git a/third_party/perftools/profiles/proto/builder.h b/third_party/perftools/profiles/proto/builder.h
index 719617b16..73fae393f 100644
--- a/third_party/perftools/profiles/proto/builder.h
+++ b/third_party/perftools/profiles/proto/builder.h
@@ -87,6 +87,9 @@ class Builder {
   // Adds mappings for the currently running binary to the profile.
   void AddCurrentMappings();
 
+  // Add documentation URL.
+  void SetDocURL(const std::string &url);
+
   // Prepares the profile for encoding. Returns true on success.
   // If the profile has no locations, inserts location using the
   // location_ids from the samples as addresses.
@@ -128,12 +131,17 @@ class Builder {
   Profile *mutable_profile() { return profile_.get(); }
 
  private:
+  int64_t InternalStringId(const std::string &str);
+
   // Maps to deduplicate strings and functions.
   StringIndexMap strings_;
   FunctionIndexMap functions_;
 
   // Actual profile being updated.
   std::unique_ptr<Profile> profile_;
+
+  // Any error that may have been encountered while building the profile.
+  std::string error_;
 };
 
 }  // namespace profiles
diff --git a/third_party/perftools/profiles/proto/profile.proto b/third_party/perftools/profiles/proto/profile.proto
index c154c83e3..81050c26f 100644
--- a/third_party/perftools/profiles/proto/profile.proto
+++ b/third_party/perftools/profiles/proto/profile.proto
@@ -93,6 +93,12 @@ message Profile {
   // Index into the string table of the type of the preferred sample
   // value. If unset, clients should default to the last sample value.
   int64 default_sample_type = 14;
+  // Documentation link for this profile. The URL must be absolute,
+  // e.g., http://pprof.example.com/cpu-profile.html
+  //
+  // The URL may be missing if the profile was generated by older code or code
+  // that did not bother to supply a link.
+  int64 doc_url = 15;  // Index into string table.
 }
 
 // ValueType describes the semantics and measurement units of a value.