Chore: small cosmetic 🎨 (#50)

Author: regadas

plugin/src/main/java/dev/regadas/trino/pubsub/listener/metrics/DecayRatio.java

@@ -5,8 +5,10 @@
 import io.airlift.stats.DecayCounter;
 import java.util.List;
 import java.util.function.Function;
+import javax.annotation.concurrent.ThreadSafe;
 import org.weakref.jmx.Managed;
 
+@ThreadSafe
 public final class DecayRatio {
     private final DecayCounter numeratorCounter;
     private final List<DecayCounter> denominatorCounters;

plugin/src/main/java/dev/regadas/trino/pubsub/listener/metrics/RatioStat.java

@@ -6,9 +6,11 @@
 import io.airlift.stats.DecayCounter;
 import java.util.List;
 import java.util.function.Function;
+import javax.annotation.concurrent.ThreadSafe;
 import org.weakref.jmx.Managed;
 import org.weakref.jmx.Nested;
 
+@ThreadSafe
 public class RatioStat {
     private final CounterStat numeratorCounter;
     private final List<CounterStat> denominatorCounters;