Override Container Insights Metrics

Can you please post the default configuration for the `metrics` section of the config json so that we can override it? The default is more than we need and the costs are prohibitive.

```json
{
"agent": {
"region": "${var.aws_region}"
},
"metrics": {
???
},
"logs": {
"metrics_collected": {
"kubernetes": {
"cluster_name": "${var.cluster_name}",
"metrics_collection_interval": 60
}
},
"force_flush_interval": 5
}
}
```

It would be nice if there was an exclude as it would be easier to configure this way. I don't need disk or network stats, for example.

Start with the metrics section of the config JSON shown in the issue and the repository's Kubernetes YAML templates. Determine where the default Container Insights metrics are defined and how configuration overrides are passed through. Done means users can override the defaults, including omitting disk and network metrics, with documented behavior.

Written by the indexing model from the issue text.