Actually drop container_network metrics (#453)

We added container_network.* to the wrong part of the values so they are
still the highest-cardinality metrics (around 15% of all metrics).

Most of the new lines are copy-pasted from the default values.yaml in
the Chart, this change just adds container_network.

Tested by using `bazel build
src/app_charts/prometheus/prometheus-operator-chart.robot.yaml` to build
the YAML and diffing:

```
--- /tmp/before.yaml    2024-10-10 15:40:11.686509000 +0000
+++ /tmp/after.yaml     2024-10-10 15:52:02.595166797 +0000
@@ -1192,7 +1192,7 @@
       sourceLabels:
       - __name__
     - action: drop
-      regex: container_spec.*
+      regex: container_spec.*|container_network.*
       sourceLabels:
       - __name__
     - action: drop
```

then manually applying this change with k9s to a lab system and
verifying that the metric stops flowing to the cloud.

src/app_charts/prometheus/prometheus-robot.values.yaml

@@ -138,6 +138,26 @@ kubelet:
     - action: drop
       regex: "container_network.*|container_blkio.*|kubelet_.*|kubernetes_feature_enabled|container_fs.*|container_processes|container_last_seen|storage_operation_duration_seconds_bucket"
       sourceLabels: [__name__]
+    cAdvisorMetricRelabelings:
+    # Drop high cardinality metrics from kubelet. (with metrics_path="/metrics/cadvisor")
+    - sourceLabels: [__name__]
+      action: drop
+      regex: 'container_cpu_(cfs_throttled_seconds_total|load_average_10s|system_seconds_total|user_seconds_total)'
+    - sourceLabels: [__name__]
+      action: drop
+      regex: 'container_fs_(io_current|io_time_seconds_total|io_time_weighted_seconds_total|reads_merged_total|sector_reads_total|sector_writes_total|writes_merged_total)'
+    - sourceLabels: [__name__]
+      action: drop
+      regex: 'container_memory_(mapped_file|swap)'
+    - sourceLabels: [__name__]
+      action: drop
+      regex: 'container_(file_descriptors|tasks_state|threads_max)'
+    - sourceLabels: [__name__]
+      action: drop
+      regex: 'container_spec.*|container_network.*'
+    - sourceLabels: [id, pod]
+      action: drop
+      regex: '.+;'
     relabelings:
     - sourceLabels: [__meta_kubernetes_pod_node_name]
       targetLabel: instance