[doc] add instruction to close metrics port (#1669)

developer-docs-site/docs/nodes/ait/connect-to-testnet.md

@@ -17,19 +17,36 @@ Before joining the testnet, you need to bootstrap your node with the genesis blo
 - Stop your node and remove the data directory.
 - Download the `genesis.blob` and `waypoint.txt` file published by Aptos Labs team.
 - Pull the latest changes on `testnet` branch, make sure you're at commit `3b53225b5a1effcce5dee9597a129216510dc424`
+- Close the metrics port `9101` for your validator and fullnode
 - Restarting the node
 
 ### Using Docker
 
 - Stop your node and remove the data volumes, `docker compose down --volumes`
 - Download the `genesis.blob` and `waypoint.txt` file published by Aptos Labs team.
 - Update your docker image to use tag `testnet_3b53225b5a1effcce5dee9597a129216510dc424`. Check the image sha256 [here](https://hub.docker.com/layers/validator/aptoslabs/validator/testnet_3b53225b5a1effcce5dee9597a129216510dc424/images/sha256-1625f70457a6060ae2e64e699274e1ddca02cb7856406a40d1891b6bf84ae072?context=explore)
+- Close metrics port on 9101 for your validator and fullnode (remove it from the docker compose file)
 - Restarting the node: `docker compose up`
 
 ### Using Terraform
 
 - Increase `era` number in your Terraform config, this will wipe the data once applied.
 - Update your docker image to use tag `testnet_3b53225b5a1effcce5dee9597a129216510dc424` in the Terraform config. Check the image sha256 [here](https://hub.docker.com/layers/validator/aptoslabs/validator/testnet_3b53225b5a1effcce5dee9597a129216510dc424/images/sha256-1625f70457a6060ae2e64e699274e1ddca02cb7856406a40d1891b6bf84ae072?context=explore)
+- Close metrics port for validator and fullnode, add the helm values in your `main.tf ` file, for example:
+    ```
+    module "aptos-node" {
+        ...
+
+        helm_values = {
+            service = {
+            validator = {
+                enableMetricsPort = false
+              }
+            }
+        }
+    }
+
+    ```
 - Apply Terraform: `terraform apply`
 - Download the `genesis.blob` and `waypoint.txt` file published by Aptos Labs team.
 - Recreate the secrets, make sure the secret name matches your `era` number, e.g. if you have `era = 3`, you should replace the secret name to be `${WORKSPACE}-aptos-node-0-genesis-e3`