chore: update README for monitoring module

Refresh the list of input arguments

provisioning/terraform/monitoring/README.md

@@ -13,7 +13,11 @@ The following table describes all input arguments the module accepts:
 | filepath_configuration | `string` | | A path to the root folder storing configuration files and templates. The relative path should be defined relative to the root terraform folder |
 | frontend_external_ip | `string` | ✔️ | A valid IPv4 address of the publicly available endpoint of the frontend service |
 | gcp_project_id | `string` | ✔️ | A project id of the GCP project that hosts Cloud Ops Sandbox |
-| notification_channel_email | `string` || A valid email address to be used as a destination for alert notifications |
+| gcp_project_number | `string` | ✔️ | A project number corresponding to the project id. Passed explicitly to save API call because it is known in the parent terraform. |
+| gke_cluster_name | `string` || Name of the GKE cluster that hosting the demo app. Defaults to `cloud-ops-sandbox`. |
+| gke_cluster_location | `string` || Location of the GKE cluster that hosting the demo app. Defaults to `default`. |
+| name_suffix | `string` || Forwarding suffix string from parent terraform to enable resource customization when multiple Sandboxes are provisioned in the same project. Defaults to empty string. |
+| notification_channel_email | `string` || A valid email address to be used as a destination for alert notifications. Defaults to `devops@acme.com`. |
 
 ## What's included