Delete the TODO ("get rid of allocations") tag in the WALProcedureStore class

// update webui circular buffers (TODO: get rid of allocations)
final SyncMetrics syncMetrics = new SyncMetrics();
syncMetrics.timestamp = currentTs;
syncMetrics.syncWaitMs = syncWaitMs;
syncMetrics.syncedEntries = slotIndex;
syncMetrics.totalSyncedBytes = totalSyncedToStore;
syncMetrics.syncedPerSec = syncedPerSec;
syncMetricsQueue.add(syncMetrics);