istio configmap mesh log level

To configure the log level for the Istio mesh, you can create a `MeshConfig` resource with the desired log level settings and apply it to your Istio installation. Here is an example `MeshConfig` resource that sets the log level for all components to `debug`:

apiVersion: install.istio.io/v1alpha1
kind: MeshConfig
metadata:
  name: default
spec:
  defaultConfig:
    proxyLogLevel: "debug"
    istioLogLevel: "debug"

After creating this resource, you can apply it to your Istio installation using the following command:

kubectl apply -f meshconfig.yaml

Note that this will set the log level for all components in the mesh to `debug`, which may generate a large amount of log data. You can customize the log level for individual components by modifying the `defaultConfig` section of the `MeshConfig` resource. You can also reference the Istio documentation for more information on how to configure the mesh log level.