Support buildid xaxis for opmon (#481)

generator/dashboards/templates/dashboard.lkml

@@ -26,7 +26,7 @@
     col: {{element.col}}
     width: 12
     height: 8
-    field_x: {{element.explore}}.submission_date
+    field_x: {{element.explore}}.{{element.xaxis}}
     field_y: {{element.explore}}.percentile
     log_scale: false
     ci_lower: {{element.explore}}.low
@@ -48,10 +48,10 @@
     model: operational_monitoring
     explore: {{alerts.explore}}
     type: looker_grid
-    fields: [{{alerts.explore}}.submission_date,
+    fields: [{{alerts.explore}}.{{element.xaxis}},
       {{alerts.explore}}.probe, {{alerts.explore}}.percentile,
       {{alerts.explore}}.message, {{alerts.explore}}.branch, {{alerts.explore}}.errors]
-    sorts: [{{alerts.explore}}.submission_date
+    sorts: [{{alerts.explore}}.{{element.xaxis}}
         desc]
     limit: 500
     show_view_names: false

tests/test_operational_monitoring.py

@@ -364,7 +364,7 @@ def test_dashboard_lookml(operational_monitoring_dashboard):
           col: 0
           width: 12
           height: 8
-          field_x: fission_histogram.submission_date
+          field_x: fission_histogram.build_id
           field_y: fission_histogram.percentile
           log_scale: false
           ci_lower: fission_histogram.low
@@ -397,7 +397,7 @@ def test_dashboard_lookml(operational_monitoring_dashboard):
           col: 12
           width: 12
           height: 8
-          field_x: fission_histogram.submission_date
+          field_x: fission_histogram.build_id
           field_y: fission_histogram.percentile
           log_scale: false
           ci_lower: fission_histogram.low