apachedex: Implement a duration cap.

apachedex/__init__.py

@@ -1309,6 +1309,12 @@ def main():
     'but requires pytz module, fixed UTC offsets can be provided in the '
     '+hhmm form (ex: -0700 for UTC-7). This form does not require pytz '
     'module.')
+  parser.add_argument('--duration-cap', type=float,
+    help='Duration, in seconda, to set as an upper limit to request '
+    'durations: anything longer than this will be set to this value. '
+    'Useful when migrating from one configuration/software package to '
+    'another while keeping results comparable even if the latter has a '
+    'much larger (and possibly non-configurable) total request timeout.')
 
   group = parser.add_argument_group('generated content (all formats)')
   group.add_argument('-a', '--apdex', default=1.0, type=float,
@@ -1384,6 +1390,16 @@ def main():
   else:
     parser.error('Neither %D nor %T are present in logformat, apdex '
       'cannot be computed.')
+  if args.duration_cap:
+    def getDuration(
+      match,
+      _duration_cap=int(args.duration_cap * US_PER_S),
+      _getDuration=getDuration,
+    ):
+      duration = _getDuration(match)
+      if duration > _duration_cap:
+        return _duration_cap
+      return duration
   if args.match_servername is not None and \
       args.match_servername not in args.logformat:
     parser.error('--match-servername %s requested, but missing '