Address David's comments

backend/telemetry_core/src/aggregator/aggregator.rs

@@ -37,7 +37,7 @@ pub struct Aggregator(Arc<AggregatorInternal>);
 struct AggregatorInternal {
     /// Shards that connect are each assigned a unique connection ID.
     /// This helps us know who to send messages back to (especially in
-    /// conjunction with the [`LocalId`] that messages will come with).
+    /// conjunction with the `ShardNodeId` that messages will come with).
     shard_conn_id: AtomicU64,
     /// Feeds that connect have their own unique connection ID, too.
     feed_conn_id: AtomicU64,

backend/telemetry_core/src/state/chain.rs

@@ -97,7 +97,7 @@ impl Chain {
     }
 
     /// Can we add a node? If not, it's because the chain is at its quota.
-    pub fn can_add_node(&self) -> bool {
+    pub fn is_overquota(&self) -> bool {
         // Dynamically determine the max nodes based on the most common
         // label so far, in case it changes to something with a different limit.
         self.nodes.len() < max_nodes(self.labels.best())
@@ -105,7 +105,7 @@ impl Chain {
 
     /// Assign a node to this chain.
     pub fn add_node(&mut self, node: Node) -> AddNodeResult {
-        if !self.can_add_node() {
+        if !self.is_overquota() {
             return AddNodeResult::Overquota;
         }