Remove the PstmtCache putCount as its just hitCount + missCount

So we can remove this as it is a redundant metric

Author: rbygrave

ebean-datasource/src/main/java/io/ebean/datasource/pool/ConnectionPool.java

@@ -99,7 +99,6 @@ interface Heartbeat {
   private final long leakTimeMinutes;
   private final LongAdder pscHit = new LongAdder();
   private final LongAdder pscMiss = new LongAdder();
-  private final LongAdder pscPut = new LongAdder();
   private final LongAdder pscRem = new LongAdder();
 
   private final boolean shutdownOnJvmExit;
@@ -165,7 +164,6 @@ private void init() {
   void pstmtCacheMetrics(PstmtCache pstmtCache) {
     pscHit.add(pstmtCache.hitCount());
     pscMiss.add(pstmtCache.missCount());
-    pscPut.add(pstmtCache.putCount());
     pscRem.add(pstmtCache.removeCount());
   }
 
@@ -686,9 +684,9 @@ private void shutdownPool(boolean fullShutdown, boolean fromHook) {
         shutdownExecutor();
       }
       if (fromHook) {
-        Log.info("DataSource [{0}] shutdown on JVM exit {1}  psc[hit:{2} miss:{3} put:{4} rem:{5}]", name, status, pscHit, pscMiss, pscPut, pscRem);
+        Log.info("DataSource [{0}] shutdown on JVM exit {1}  psc[hit:{2} miss:{3} rem:{4}]", name, status, pscHit, pscMiss, pscRem);
       } else {
-        Log.info("DataSource [{0}] shutdown {1}  psc[hit:{2} miss:{3} put:{4} rem:{5}]", name, status, pscHit, pscMiss, pscPut, pscRem);
+        Log.info("DataSource [{0}] shutdown {1}  psc[hit:{2} miss:{3} rem:{4}]", name, status, pscHit, pscMiss, pscRem);
         removeShutdownHook();
       }
     } finally {

ebean-datasource/src/main/java/io/ebean/datasource/pool/PstmtCache.java

@@ -15,7 +15,6 @@ final class PstmtCache extends LinkedHashMap<String, ExtendedPreparedStatement>
   private long removeCount;
   private long hitCount;
   private long missCount;
-  private long putCount;
 
   PstmtCache(int maxCacheSize) {
     // note = access ordered list.  This is what gives it the LRU order
@@ -53,10 +52,6 @@ long removeCount() {
     return removeCount;
   }
 
-  long putCount() {
-    return putCount;
-  }
-
   /**
    * Try to add the returning statement to the cache. If there is already a
    * matching ExtendedPreparedStatement in the cache return false else add
@@ -105,12 +100,6 @@ public ExtendedPreparedStatement remove(Object key) {
     return o;
   }
 
-  @Override
-  public ExtendedPreparedStatement put(String key, ExtendedPreparedStatement value) {
-    putCount++;
-    return super.put(key, value);
-  }
-
   @Override
   protected boolean removeEldestEntry(Map.Entry<String, ExtendedPreparedStatement> eldest) {
     if (size() < maxSize) {