Link from fullnode doc to fullnode-template.yaml, note metrics port (M…

…ystenLabs#2643)

* Update fullnode.md

* Note the default metrics port is 9184

doc/src/build/fullnode.md

@@ -150,7 +150,7 @@ to run a Sui fullnode using Docker.
     ```shell
     $ git checkout --track upstream/devnet
     ```
-1. Make a copy of the fullnode configuration template:
+1. Make a copy of the [fullnode configuration template](https://github.com/MystenLabs/sui/blob/main/crates/sui-config/data/fullnode-template.yaml):
    ```shell
    $ cp crates/sui-config/data/fullnode-template.yaml fullnode.yaml
    ```
@@ -206,6 +206,8 @@ The Explorer will now use your local fullnode to explore the state of the chain.
 Monitor your fullnode using the instructions at [Logging, Tracing, Metrics, and
 Observability](https://docs.sui.io/contribute/observability).
 
+Note the default metrics port is 9184 yet configurable in your `fullnode.yaml` file.
+
 ## Updating your fullnode with new releases
 
 Whenever a new release is deployed to `devnet`, the blockchain state is