Add documentation and log to PerformanceFilter

freqtrade/plugins/pairlist/PerformanceFilter.py

@@ -70,7 +70,13 @@ class PerformanceFilter(IPairList):
             .fillna(0).sort_values(by=['count', 'pair'], ascending=True)\
             .sort_values(by=['profit'], ascending=False)
         if self._min_profit is not None:
+            removed = sorted_df[sorted_df['profit'] < self._min_profit]
+            for _, row in removed.iterrows():
+                self.log_once(
+                    f"Removing pair {row['pair']} since {row['profit']} is "
+                    f"below {self._min_profit}", logger.info)
             sorted_df = sorted_df[sorted_df['profit'] >= self._min_profit]
+
         pairlist = sorted_df['pair'].tolist()
 
         return pairlist