[sui-proxy/ remove remote_host label] (MystenLabs#11603)

Summary:

* this causes undesirable behavior with some of our queries when we add
multiple proxy backends.
* we don't need this data so, lets remove it. It should fall out of
scope from the tsdb in time, without issue.

Test Plan:

cargo build

---
If your changes are not user-facing and not a breaking change, you can
skip the following section. Otherwise, please indicate what changed, and
then add to the Release Notes section as highlighted during the release
process.

### Type of Change (Check all that apply)

- [ ] user-visible impact
- [ ] breaking change for a client SDKs
- [ ] breaking change for FNs (FN binary must upgrade)
- [ ] breaking change for validators or node operators (must upgrade
binaries)
- [ ] breaking change for on-chain data layout
- [ ] necessitate either a data wipe or data migration

### Release notes

crates/sui-proxy/src/consumer.rs

@@ -101,9 +101,10 @@ impl ProtobufDecoder {
 
 // populate labels in place for our given metric family data
 pub fn populate_labels(
-    name: String,               // host field for grafana agent (from chain data)
-    network: String,            // network name from ansible (via config)
-    inventory_hostname: String, // inventory_name from ansible (via config)
+    name: String,    // host field for grafana agent (from chain data)
+    network: String, // network name from ansible (via config)
+    // TODO use in stderr logging, see below
+    _inventory_hostname: String, // inventory_name from ansible (via config)
     data: Vec<proto::MetricFamily>,
 ) -> Vec<proto::MetricFamily> {
     let timer = CONSUMER_OPERATION_DURATION
@@ -119,11 +120,12 @@ pub fn populate_labels(
     host_label.set_name("host".into());
     host_label.set_value(name);
 
-    let mut relay_host_label = proto::LabelPair::default();
-    relay_host_label.set_name("relay_host".into());
-    relay_host_label.set_value(inventory_hostname);
+    // TODO add this back in via stderr logging only and not in relayed samples
+    // let mut relay_host_label = proto::LabelPair::default();
+    // relay_host_label.set_name("relay_host".into());
+    // relay_host_label.set_value(inventory_hostname);
 
-    let labels = vec![network_label, host_label, relay_host_label];
+    let labels = vec![network_label, host_label];
 
     let mut data = data;
     // add our extra labels to our incoming metric data
@@ -330,7 +332,6 @@ mod tests {
             &create_labels(vec![
                 ("network", "unittest-network"),
                 ("host", "validator-0"),
-                ("relay_host", "inventory-hostname"),
             ])
         );
     }