agent-flow-mixin: fix visualization for concurrent classic and native…

… histograms (#6607)

If both classic and native histograms are visualized concurrently, the
old query would not consistently work properly in Grafana, as the `or`
operator would return both classic and native histograms.

This would cause Grafana to visualize the histograms inconsistently,
sometimes showing nothing for time ranges where native histogram data
should be available.

operations/agent-flow-mixin/dashboards/controller.libsonnet

@@ -288,7 +288,7 @@ local filename = 'agent-flow-controller.json';
           panel.newQuery(
             expr=|||
               sum by (le) (increase(agent_component_evaluation_seconds{cluster="$cluster", namespace="$namespace"}[$__rate_interval]))
-              or
+              or ignoring (le)
               sum by (le) (increase(agent_component_evaluation_seconds_bucket{cluster="$cluster", namespace="$namespace"}[$__rate_interval]))
             |||,
             format='heatmap',
@@ -313,7 +313,7 @@ local filename = 'agent-flow-controller.json';
           panel.newQuery(
             expr=|||
               sum by (le) (increase(agent_component_dependencies_wait_seconds{cluster="$cluster", namespace="$namespace"}[$__rate_interval]))
-              or
+              or ignoring (le)
               sum by (le) (increase(agent_component_dependencies_wait_seconds_bucket{cluster="$cluster", namespace="$namespace"}[$__rate_interval]))
             |||,
             format='heatmap',