add console message when number of adunits exceeds point (#3707)

* add console message when number of adunits exceeds point

* include additional information in log message

Author: jsnellbaker

src/prebid.js

@@ -467,6 +467,12 @@ $$PREBID_GLOBAL$$.requestBids = hook('async', function ({ bidsBackHandler, timeo
   }
 
   const auction = auctionManager.createAuction({adUnits, adUnitCodes, callback: bidsBackHandler, cbTimeout, labels});
+
+  let adUnitsLen = adUnits.length;
+  if (adUnitsLen > 15) {
+    utils.logInfo(`Current auction ${auction.getAuctionId()} contains ${adUnitsLen} adUnits.`, adUnits);
+  }
+
   adUnitCodes.forEach(code => targeting.setLatestAuctionForAdUnit(code, auction.getAuctionId()));
   auction.callBids();
   return auction;