[grpc][Gpr_To_Absl_Logging] Migrating from gpr to absl logging GPR_ASSERT (#36359)

<!--

If you know who should review your pull request, please assign it to that
person, otherwise the pull request would get assigned randomly.

If your pull request is for a specific language, please add the appropriate
lang label.

-->

Closes #36359

PiperOrigin-RevId: 625183028

examples/cpp/csm/BUILD

@@ -41,6 +41,7 @@ cc_binary(
         "//examples/protos:helloworld_cc_grpc",
         "@com_google_absl//absl/flags:flag",
         "@com_google_absl//absl/flags:parse",
+        "@com_google_absl//absl/log",
         "@io_opentelemetry_cpp//exporters/prometheus:prometheus_exporter",
         "@io_opentelemetry_cpp//sdk/src/metrics",
     ],

examples/cpp/csm/csm_greeter_server.cc

@@ -22,6 +22,7 @@
 
 #include "absl/flags/flag.h"
 #include "absl/flags/parse.h"
+#include "absl/log/log.h"
 #include "absl/strings/str_cat.h"
 #include "opentelemetry/exporters/prometheus/exporter_factory.h"
 #include "opentelemetry/exporters/prometheus/exporter_options.h"
@@ -91,7 +92,7 @@ void RunServer(const char* hostname) {
   xds_builder.AddListeningPort(absl::StrCat("0.0.0.0:", port),
                                grpc::InsecureServerCredentials());
   xds_enabled_server = xds_builder.BuildAndStart();
-  gpr_log(GPR_INFO, "Server starting on 0.0.0.0:%d", port);
+  LOG(INFO) << "Server starting on 0.0.0.0:" << port;
 
   // Wait for the server to shutdown. Note that some other thread must be
   // responsible for shutting down the server for this call to ever return.

examples/cpp/helloworld/BUILD

@@ -129,5 +129,6 @@ cc_binary(
         "//examples/protos:helloworld_cc_grpc",
         "@com_google_absl//absl/flags:flag",
         "@com_google_absl//absl/flags:parse",
+        "@com_google_absl//absl/log",
     ],
 )

examples/cpp/helloworld/CMakeLists.txt

@@ -68,6 +68,7 @@ foreach(_target
     absl::check
     absl::flags
     absl::flags_parse
+    absl::log
     ${_REFLECTION}
     ${_GRPC_GRPCPP}
     ${_PROTOBUF_LIBPROTOBUF})

examples/cpp/helloworld/xds_greeter_server.cc

@@ -22,6 +22,7 @@
 
 #include "absl/flags/flag.h"
 #include "absl/flags/parse.h"
+#include "absl/log/log.h"
 #include "absl/strings/str_cat.h"
 
 #include <grpcpp/ext/admin_services.h>
@@ -79,21 +80,20 @@ void RunServer() {
         absl::StrCat("0.0.0.0:", port),
         grpc::XdsServerCredentials(grpc::InsecureServerCredentials()));
     xds_enabled_server = xds_builder.BuildAndStart();
-    gpr_log(GPR_INFO, "Server starting on 0.0.0.0:%d", port);
+    LOG(INFO) << "Server starting on 0.0.0.0:" << port;
     grpc::AddAdminServices(&builder);
     // For the maintenance server, do not use any authentication mechanism.
     builder.AddListeningPort(absl::StrCat("0.0.0.0:", maintenance_port),
                              grpc::InsecureServerCredentials());
     server = builder.BuildAndStart();
-    gpr_log(GPR_INFO, "Maintenance server listening on 0.0.0.0:%d",
-            maintenance_port);
+    LOG(INFO) << "Maintenance server listening on 0.0.0.0:" << maintenance_port;
   } else {
     grpc::AddAdminServices(&xds_builder);
     // Listen on the given address without any authentication mechanism.
     builder.AddListeningPort(absl::StrCat("0.0.0.0:", port),
                              grpc::InsecureServerCredentials());
     server = xds_builder.BuildAndStart();
-    gpr_log(GPR_INFO, "Server listening on 0.0.0.0:%d", port);
+    LOG(INFO) << "Server listening on 0.0.0.0:" << port;
   }
 
   // Wait for the server to shutdown. Note that some other thread must be

examples/cpp/xds/BUILD

@@ -37,5 +37,6 @@ cc_binary(
         "//examples/protos:helloworld_cc_grpc",
         "@com_google_absl//absl/flags:flag",
         "@com_google_absl//absl/flags:parse",
+        "@com_google_absl//absl/log",
     ],
 )

examples/cpp/xds/xds_greeter_server.cc

@@ -22,6 +22,7 @@
 
 #include "absl/flags/flag.h"
 #include "absl/flags/parse.h"
+#include "absl/log/log.h"
 #include "absl/strings/str_cat.h"
 
 #include <grpcpp/ext/admin_services.h>
@@ -84,21 +85,20 @@ void RunServer() {
         absl::StrCat("0.0.0.0:", port),
         grpc::XdsServerCredentials(grpc::InsecureServerCredentials()));
     xds_enabled_server = xds_builder.BuildAndStart();
-    gpr_log(GPR_INFO, "Server starting on 0.0.0.0:%d", port);
+    LOG(INFO) << "Server starting on 0.0.0.0:" << port;
     grpc::AddAdminServices(&builder);
     // For the maintenance server, do not use any authentication mechanism.
     builder.AddListeningPort(absl::StrCat("0.0.0.0:", maintenance_port),
                              grpc::InsecureServerCredentials());
     server = builder.BuildAndStart();
-    gpr_log(GPR_INFO, "Maintenance server listening on 0.0.0.0:%d",
-            maintenance_port);
+    LOG(INFO) << "Maintenance server listening on 0.0.0.0:" << maintenance_port;
   } else {
     grpc::AddAdminServices(&xds_builder);
     // Listen on the given address without any authentication mechanism.
     builder.AddListeningPort(absl::StrCat("0.0.0.0:", port),
                              grpc::InsecureServerCredentials());
     server = xds_builder.BuildAndStart();
-    gpr_log(GPR_INFO, "Server listening on 0.0.0.0:%d", port);
+    LOG(INFO) << "Server listening on 0.0.0.0:" << port;
   }
 
   // Wait for the server to shutdown. Note that some other thread must be