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?
{
    
    
    return WalletBatch::Recover(wallet_path, nullptr, nullptr, out_backup_filename);
}
bool WalletBatch::RecoverKeysOnlyFilter(void *callbackData, CDataStream ssKey, CDataStream ssValue)
{
    CWallet *dummyWallet = reinterpret_cast<CWallet*>(callbackData);
    CWalletScanState dummyWss;
    std::string strType, strErr;
    bool fReadOK;
    {
        
        LOCK(dummyWallet->cs_wallet);
        fReadOK = ReadKeyValue(dummyWallet, ssKey, ssValue,
                               dummyWss, strType, strErr);
    }
    if (!IsKeyType(strType) && strType != "hdchain")
        return false;
    if (!fReadOK)
    {
        LogPrintf("WARNING: WalletBatch::Recover skipping %s: %s\n", strType, strErr);
        return false;
    }
    return true;
}
bool WalletBatch::VerifyEnvironment(const fs::path& wallet_path, std::string& errorStr)