f more decay docs

Author: TheBlueMatt

lightning/src/routing/scoring.rs

@@ -512,7 +512,9 @@ impl HistoricalBucketRangeTracker {
 			}
 		}
 	}
-	fn decay_data(&mut self, half_lives: u32) {
+	/// Decay all buckets by the given number of half-lives. Used to more aggressively remove old
+	/// datapoints as we receive newer information.
+	fn time_decay_data(&mut self, half_lives: u32) {
 		for e in self.buckets.iter_mut() {
 			*e = e.checked_shr(half_lives).unwrap_or(0);
 		}
@@ -948,8 +950,8 @@ impl<L: DerefMut<Target = u64>, BRT: DerefMut<Target = HistoricalBucketRangeTrac
 		let half_lives = self.now.duration_since(*self.last_updated).as_secs()
 			.checked_div(self.params.historical_no_updates_half_life.as_secs())
 			.map(|v| v.try_into().unwrap_or(u32::max_value())).unwrap_or(u32::max_value());
-		self.min_liquidity_offset_history.decay_data(half_lives);
-		self.max_liquidity_offset_history.decay_data(half_lives);
+		self.min_liquidity_offset_history.time_decay_data(half_lives);
+		self.max_liquidity_offset_history.time_decay_data(half_lives);
 
 		debug_assert!(*self.min_liquidity_offset_msat <= self.capacity_msat);
 		self.min_liquidity_offset_history.track_datapoint(