add special logger for throughput metrics

so that we can enable/disable it individually

pdb-plotting/src/main/java/org/lucares/recommind/logs/TcpIngestor.java

@@ -34,6 +34,7 @@ import com.fasterxml.jackson.databind.ObjectReader;
 
 public class TcpIngestor implements AutoCloseable {
 	private static final Logger LOGGER = LoggerFactory.getLogger(TcpIngestor.class);
+	private static final Logger METRICS_LOGGER = LoggerFactory.getLogger("org.lucares.metrics.tcpIngestor");
 
 	public static final int PORT = 17347;
 
@@ -87,7 +88,7 @@ public class TcpIngestor implements AutoCloseable {
 
 					count++;
 					if (count == 100000) {
-						LOGGER.debug("reading {} took {} ms", count, duration);
+						METRICS_LOGGER.debug("reading {} took {} ms", count, duration);
 						duration = 0.0;
 						count = 0;
 					}