fix the unit of CH2 metrics

Change-Id: I966062aef79ea968c503cc4d27c029334ac84b4e
Reviewed-on: https://review.couchbase.org/c/perfrunner/+/169516
Tested-by: Build Bot <[email protected]>
Reviewed-by: Bo-Chun Wang <[email protected]>

Author: bochun

perfrunner/helpers/metrics.py

@@ -1311,7 +1311,7 @@ def ch2_response_time(self, response_time: float, tclients: int) -> Metric:
 
     def ch2_analytics_query_time(self, query_time: float, tclients: int) -> Metric:
         metric_id = '{}_{}'.format(self.test_config.name, "analytics_query_time")
-        title = 'Average time per analytics query set (min), {}, {} tclients'.format(self._title,
+        title = 'Average time per analytics query set (sec), {}, {} tclients'.format(self._title,
                                                                                      tclients)
 
         metric_info = self._metric_info(metric_id,