multi: add health check for remote signer

sample-lnd.conf

@@ -1006,6 +1006,23 @@ litecoin.node=ltcd
 ; value must be >= 1m.
 ; healthcheck.torconnection.interval=1m
 
+; The number of times we should attempt to check our remote signer RPC
+; connection before gracefully shutting down. Set this value to 0 to disable
+; this health check.
+; healthcheck.remotesigner.attempts=1
+
+; The amount of time we allow a call to our remote signer RPC connection to take
+; before we fail the attempt. This value must be >= 1s.
+; healthcheck.remotesigner.timeout=1s
+
+; The amount of time we should backoff between failed attempts to check remote
+; signer RPC connection. This value must be >= 1s.
+; healthcheck.remotesigner.backoff=30s
+
+; The amount of time we should wait between remote signer RPC connection health
+; checks. This value must be >= 1m.
+; healthcheck.remotesigner.interval=1m
+
 
 [signrpc]