lndmon: fix force closed balances

Previously the force closed balance for each anchor state was set to the
recovered balance. This commit fixes that by using the correct balances
for each individual state.

Author: bhandras

collectors/channels_collector.go

@@ -416,8 +416,24 @@ func (c *ChannelsCollector) Collect(ch chan<- prometheus.Metric) {
 		anchorStateToString(lndclient.ForceCloseAnchorStateLost):      0,
 	}
 	for _, forceClose := range pendingChannelsResp.PendingForceClose {
+		var balance btcutil.Amount
+		switch forceClose.AnchorState {
+		case lndclient.ForceCloseAnchorStateRecovered:
+			balance = forceClose.RecoveredBalance
+
+		case lndclient.ForceCloseAnchorStateLimbo:
+			balance = forceClose.LimboBalance
+
+		case lndclient.ForceCloseAnchorStateLost:
+			balance = 0
+
+		default:
+			c.errChan <- fmt.Errorf("Unknown anchor state: %v",
+				forceClose.AnchorState)
+		}
+
 		forceCloseTotal[anchorStateToString(forceClose.AnchorState)] +=
-			forceClose.RecoveredBalance
+			balance
 	}
 
 	for anchorState, balance := range forceCloseTotal {