In the log I see things like:

    2017-09-13 03:54:33 init message: Rescanning...
    2017-09-13 03:54:33 Rescanning last 68616 blocks (from block 416339)...
    2017-09-13 03:54:40 AddToWallet xxxxx  update
    2017-09-13 03:55:33 Still rescanning. At block 418849. Progress=0.549138

I would be interested to see the wallet file name on each of these log lines.

Would there be any interest in merging such a PR?
if (walletInstance->CanSupportFeature(FEATURE_HD_SPLIT)) {
            LogPrintf("Upgrading wallet to use HD chain split\n");
            walletInstance->SetMinVersion(FEATURE_PRE_SPLIT_KEYPOOL);
            split_upgrade = FEATURE_HD_SPLIT > prev_version;
        }
        
        if (split_upgrade) {
            walletInstance->MarkPreSplitKeys();
        }
        
        if (hd_upgrade) {
            if (!walletInstance->TopUpKeyPool()) {
                InitError(_("Unable to generate keys"));
                return nullptr;
            }
        }
    }
    if (fFirstRun)
    {
        
        if (!gArgs.GetBoolArg("-usehd", true)) {
            InitError(strprintf(_("Error creating %s: You can't create non-HD wallets with this version."), walletFile));
            return nullptr;
        }
        walletInstance->SetMinVersion(FEATURE_LATEST);
        if ((wallet_creation_flags & WALLET_FLAG_DISABLE_PRIVATE_KEYS)) {
            
            walletInstance->SetWalletFlag(WALLET_FLAG_DISABLE_PRIVATE_KEYS);
        } else {