[hotfix][coordination] Add log for slot allocation in FineGrainedSlotManager

This closes #15748

Author: KarmaGYZ

flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/slotmanager/DefaultSlotStatusSyncer.java

@@ -21,6 +21,7 @@
 import org.apache.flink.api.common.JobID;
 import org.apache.flink.api.common.time.Time;
 import org.apache.flink.runtime.clusterframework.types.AllocationID;
+import org.apache.flink.runtime.clusterframework.types.ResourceID;
 import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
 import org.apache.flink.runtime.clusterframework.types.SlotID;
 import org.apache.flink.runtime.concurrent.FutureUtils;
@@ -106,6 +107,14 @@ public CompletableFuture<Void> allocateSlot(
                 "Could not find a registered task manager for instance id " + instanceId + '.');
         final TaskExecutorGateway gateway =
                 taskManager.get().getTaskExecutorConnection().getTaskExecutorGateway();
+        final ResourceID resourceId = taskManager.get().getTaskExecutorConnection().getResourceID();
+
+        LOG.debug(
+                "Starting allocation of slot {} from {} for job {} with resource profile {}.",
+                allocationId,
+                resourceId,
+                jobId,
+                resourceProfile);
 
         taskManagerTracker.notifySlotStatus(
                 allocationId, jobId, instanceId, resourceProfile, SlotState.PENDING);
@@ -115,8 +124,7 @@ public CompletableFuture<Void> allocateSlot(
         // RPC call to the task manager
         CompletableFuture<Acknowledge> requestFuture =
                 gateway.requestSlot(
-                        SlotID.getDynamicSlotID(
-                                taskManager.get().getTaskExecutorConnection().getResourceID()),
+                        SlotID.getDynamicSlotID(resourceId),
                         jobId,
                         allocationId,
                         resourceProfile,