added request metrics to gain request stats from log file

utils/request_metrics.py

@@ -0,0 +1,26 @@
+#!/usr/bin/env python3
+
+import fileinput
+import json
+from collections import defaultdict
+
+def main():
+    counts = defaultdict(int)
+    times = defaultdict(int)
+    for line in fileinput.input():
+        entry = json.loads(line)
+        if entry.get('msg') not in ('call jsonrpc', 'relay http'):
+            continue
+        key = (entry['chain'], entry['method'], entry['endpoint'])
+        counts[key] += 1
+        times[key] += entry['timeSpentMS']
+
+    print('chain', 'method', 'endopint', 'avgtime', 'count')
+    for key, cnt in sorted(counts.items()):
+        tm = times[key]  # total request time
+        avg = int(tm/cnt) # average request time
+        print(key[0], key[1], key[2], avg, cnt)
+
+if __name__ == '__main__':
+    main()
+