Ensure stacktrace has a base line scope to avoid intermitted rendering issues

Signed-off-by: Dom Del Nano <ddelnano@gmail.com>

Author: ddelnano

src/pxl_scripts/px/differential_flamegraph/differential.pxl

@@ -74,4 +74,4 @@ def differential_flamegraph(start_time: str, namespace: str, pod: str, baseline_
   pod2 = pod2.drop(['node', 'namespace', 'stack_trace_id'])
 
   merged = merge_and_compute_delta(pod1, pod2, negate)
-  return merged[['stack_trace', 'count', 'delta', 'percent']]
+  return merged[['stack_trace', 'count', 'delta', 'percent', 'pod']]

src/pxl_scripts/px/differential_flamegraph/vis.json

@@ -58,6 +58,7 @@
                 "stacktraceColumn": "stack_trace",
                 "countColumn": "count",
                 "percentageColumn": "percent",
+                "podColumn": "pod",
                 "differenceColumn": "delta"
             }
         }