provide more context for EUNKNOWN logs

lib/hk-util.js

@@ -639,7 +639,15 @@ const handleGetHistory = function (Env, Server, seq, userId, parsed) {
             Server.send(userId, [0, HISTORY_KEEPER_ID, 'MSG', userId, JSON.stringify(msg)], readMore);
         }, (err) => {
             if (err && err.code !== 'ENOENT') {
-                if (err.message !== 'EINVAL') { Log.error("HK_GET_HISTORY", {
+                if (err.message === "EUNKNOWN") {
+                    Log.error("HK_GET_HISTORY", {
+                        channel: channelName,
+                        lastKnownHash: lastKnownHash,
+                        userId: userId,
+                        sessions: Object.keys(HK.getNetfluxSession(Env, userId) || {}),
+                        err: err && err.message || err,
+                    });
+                } else if (err.message !== 'EINVAL') { Log.error("HK_GET_HISTORY", {
                     channel: channelName,
                     err: err && err.message || err,
                     stack: err && err.stack,