[export] [grpc][Gpr_To_Absl_Logging] Migrating from gpr to absl loggi…

…ng - gpr_log

In this CL we are migrating from gRPCs own gpr logging mechanism to absl logging mechanism. The intention is to deprecate gpr_log in the future.
We have the following mapping
1. gpr_log(GPR_INFO,...) -> LOG(INFO)
2. gpr_log(GPR_ERROR,...) -> LOG(ERROR)
3. gpr_log(GPR_DEBUG,...) -> VLOG(2)
Reviewers need to check :
1. If the above mapping is correct.
2. The content of the log is as before.
gpr_log format strings did not use string_view or std::string . absl LOG accepts these. So there will be some elimination of string_view and std::string related conversions. This is expected.

----
DO NOT SUBMIT. This PR is for testing purposes only. [cl/633802447](http://cl/633802447)

PiperOrigin-RevId: 633802447

src/cpp/ext/csm/csm_observability.cc

@@ -23,14 +23,14 @@
 #include <utility>
 
 #include "absl/functional/any_invocable.h"
+#include "absl/log/log.h"
 #include "absl/status/statusor.h"
 #include "absl/types/optional.h"
 #include "google/cloud/opentelemetry/resource_detector.h"
 #include "opentelemetry/sdk/metrics/meter_provider.h"
 #include "opentelemetry/sdk/resource/resource.h"
 #include "opentelemetry/sdk/resource/resource_detector.h"
 
-#include <grpc/support/log.h>
 #include <grpc/support/port_platform.h>
 #include <grpcpp/ext/csm_observability.h>
 
@@ -56,7 +56,7 @@ bool CsmChannelTargetSelector(absl::string_view target) {
   if (!g_csm_plugin_enabled) return false;
   auto uri = grpc_core::URI::Parse(target);
   if (!uri.ok()) {
-    gpr_log(GPR_ERROR, "Failed to parse URI: %s", std::string(target).c_str());
+    LOG(ERROR) << "Failed to parse URI: " << target;
     return false;
   }
   // CSM channels should have an "xds" scheme

src/cpp/server/server_context.cc

@@ -29,6 +29,7 @@
 #include <vector>
 
 #include "absl/log/check.h"
+#include "absl/log/log.h"
 #include "absl/strings/str_format.h"
 #include "absl/strings/string_view.h"
 
@@ -38,7 +39,6 @@
 #include <grpc/load_reporting.h>
 #include <grpc/status.h>
 #include <grpc/support/alloc.h>
-#include <grpc/support/log.h>
 #include <grpc/support/time.h>
 #include <grpcpp/completion_queue.h>
 #include <grpcpp/ext/call_metric_recorder.h>
@@ -347,7 +347,7 @@ void ServerContextBase::TryCancel() const {
       grpc_call_cancel_with_status(call_.call, GRPC_STATUS_CANCELLED,
                                    "Cancelled on the server side", nullptr);
   if (err != GRPC_CALL_OK) {
-    gpr_log(GPR_ERROR, "TryCancel failed with: %d", err);
+    LOG(ERROR) << "TryCancel failed with: " << err;
   }
 }