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# Release Notes
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## Networking & Tor
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A new flag has been added to enable a hybrid tor connectivity mode, where tor
is only used for onion address connections, and clearnet for everything else.
This new behavior can be added using the `tor.skip-proxy-for-clearnet-targets`
flag.
## Backend Enhancements & Optimizations
### Full remote database support
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`lnd` now stores [all its data in the same remote/external
database](https://github.com/lightningnetwork/lnd/pull/5484) such as `etcd`
instead of only the channel state and wallet data. This makes `lnd` fully
stateless and therefore makes switching over to a new leader instance almost
instantaneous. Read the [guide on leader
election](https://github.com/lightningnetwork/lnd/blob/master/docs/leader_election.md)
for more information.
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## RPC Server
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* [Return payment address and add index from
addholdinvoice call](https://github.com/lightningnetwork/lnd/pull/5533).
* [The versions of several gRPC related libraries were bumped and the main
`rpc.proto` was renamed to
`lightning.proto` ](https://github.com/lightningnetwork/lnd/pull/5473) to fix
a warning related to protobuf file name collisions.
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* [Stub code for interacting with `lnrpc` from a WASM context through JSON
messages was added](https://github.com/lightningnetwork/lnd/pull/5601).
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* LND now [reports to systemd ](https://github.com/lightningnetwork/lnd/pull/5536 )
that RPC is ready (port bound, certificate generated, macaroons created,
in case of `wallet-unlock-password-file` wallet unlocked). This can be used to
avoid misleading error messages from dependent services if they use `After`
systemd option.
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## Wallet
* It is now possible to fund a psbt [without specifying any
outputs](https://github.com/lightningnetwork/lnd/pull/5442). This option is
useful for CPFP bumping of unconfirmed outputs or general utxo consolidation.
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* The internal wallet can now also be created or restored by using an [extended
master root key (`xprv` ) instead of an
`aezeed` ](https://github.com/lightningnetwork/lnd/pull/4717) only. This allows
wallet integrators to use existing seed mechanism that might already be in
place. **It is still not supported to use the same seed/root key on multiple
`lnd` instances simultaneously** though.
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* [Publish transaction is now reachable through
lncli](https://github.com/lightningnetwork/lnd/pull/5460).
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## Security
### Admin macaroon permissions
The default file permissions of admin.macaroon were [changed from 0600 to
0640](https://github.com/lightningnetwork/lnd/pull/5534). This makes it easier
to allow other users to manage LND. This is safe on common Unix systems
because they always create a new group for each user.
If you use a strange system or changed group membership of the group running LND
you may want to check your system to see if it introduces additional risk for
you.
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## Safety
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* Locally force closed channels are now [kept in the channel.backup file until
their time lock has fully matured](https://github.com/lightningnetwork/lnd/pull/5528).
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## Build System
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* [A new pre-submit check has been
added](https://github.com/lightningnetwork/lnd/pull/5520) to ensure that all
PRs ([aside from merge
commits](https://github.com/lightningnetwork/lnd/pull/5543)) add an entry in
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the release notes folder that at least links to PR being added.
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* [A new build target itest-race ](https://github.com/lightningnetwork/lnd/pull/5542 )
to help uncover undetected data races with our itests.
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* [The itest error whitelist check was removed to reduce the number of failed
Travis builds](https://github.com/lightningnetwork/lnd/pull/5588).
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* [A flake in the Neutrino integration tests with anchor sweeps was
addressed](https://github.com/lightningnetwork/lnd/pull/5509).
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* [The `lnwire` fuzz tests have been fixed and now run without crashing. ](https://github.com/lightningnetwork/lnd/pull/5395 )
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* [A flake in the race unit
tests](https://github.com/lightningnetwork/lnd/pull/5659) was addressed that
lead to failed tests sometimes when the CPU of the GitHub CI runner was
strained too much.
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## Documentation
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* [Outdated warning about unsupported pruning was replaced with clarification that LND **does**
support pruning](https://github.com/lightningnetwork/lnd/pull/5553)
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* [Clarified 'ErrReservedValueInvalidated' error string ](https://github.com/lightningnetwork/lnd/pull/5577 )
to explain that the error is triggered by a transaction that would deplete
funds already reserved for potential future anchor channel closings (via
CPFP) and that more information (e.g., specific sat amounts) can be found
in the debug logs.
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## Misc
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* The direct use of certain syscalls in packages such as `bbolt` or `lnd` 's own
`healthcheck` package made it impossible to import `lnd` code as a library
into projects that are compiled to WASM binaries. [That problem was fixed by
guarding those syscalls with build tags](https://github.com/lightningnetwork/lnd/pull/5526).
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## Code Health
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### Code cleanup, refactor, typo fixes
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* [Refactor the interaction between the `htlcswitch` and `peer` packages for cleaner separation. ](https://github.com/lightningnetwork/lnd/pull/5603 )
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* [Unused error check
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removed](https://github.com/lightningnetwork/lnd/pull/5537).
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* [Shorten Pull Request check list by referring to the CI checks that are
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in place](https://github.com/lightningnetwork/lnd/pull/5545).
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* [Added minor fixes to contribution guidelines ](https://github.com/lightningnetwork/lnd/pull/5503 ).
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* [Fixed typo in `dest_custom_records` description comment ](https://github.com/lightningnetwork/lnd/pull/5541 ).
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* [Fixed payment test error message. ](https://github.com/lightningnetwork/lnd/pull/5559 )
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* [Bumped version of `github.com/miekg/dns` library to fix a Dependabot
alert](https://github.com/lightningnetwork/lnd/pull/5576).
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* [Fixed timeout flakes in async payment benchmark tests ](https://github.com/lightningnetwork/lnd/pull/5579 ).
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* [Flake fix in async bidirectional payment test ](https://github.com/lightningnetwork/lnd/pull/5607 ).
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* [Fixed context timeout when closing channels in tests ](https://github.com/lightningnetwork/lnd/pull/5616 ).
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* [Fixed transaction not found in mempool flake in commitment deadline itest ](https://github.com/lightningnetwork/lnd/pull/5615 ).
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* [Fixed a missing import and git tag in the healthcheck package ](https://github.com/lightningnetwork/lnd/pull/5582 ).
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* [Fixed a data race in payment unit test ](https://github.com/lightningnetwork/lnd/pull/5573 ).
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* [Missing dots in cmd interface ](https://github.com/lightningnetwork/lnd/pull/5535 ).
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* [Link channel point logging ](https://github.com/lightningnetwork/lnd/pull/5508 )
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* [Fixed context leak in integration tests, and properly handled context
timeout](https://github.com/lightningnetwork/lnd/pull/5646).
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* [Removed nested db tx ](https://github.com/lightningnetwork/lnd/pull/5643 )
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## Database
* [Ensure single writer for legacy
code](https://github.com/lightningnetwork/lnd/pull/5547) when using etcd
backend.
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* [Optimized payment sequence generation ](https://github.com/lightningnetwork/lnd/pull/5514/ )
to make LNDs payment throughput (and latency) with better when using etcd.
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* [More robust commit queue design ](https://github.com/lightningnetwork/lnd/pull/5513 )
to make it less likely that we retry etcd transactions and make the commit
queue more scalable.
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## Performance improvements
* [Update MC store in blocks ](https://github.com/lightningnetwork/lnd/pull/5515 )
to make payment throughput better when using etcd.
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* [The `lnwire` package now uses a write buffer pool ](https://github.com/lightningnetwork/lnd/pull/4884 )
when encoding/decoding messages. Such that most of the heap escapes are fixed,
resulting in less memory being used when running `lnd` .
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## Log system
* [Save compressed log files from logrorate during
itest](https://github.com/lightningnetwork/lnd/pull/5354).
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## Bug Fixes
A bug has been fixed that would cause `lnd` to [try to bootstrap using the
currnet DNS seeds when in SigNet
mode](https://github.com/lightningnetwork/lnd/pull/5564).
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[A validation check for sane `CltvLimit` and `FinalCltvDelta` has been added for `REST`-initiated payments. ](https://github.com/lightningnetwork/lnd/pull/5591 )
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## Documentation
The [code contribution guidelines have been updated to mention the new
requirements surrounding updating the release notes for each new
change](https://github.com/lightningnetwork/lnd/pull/5613).
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# Contributors (Alphabetical Order)
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* Andras Banki-Horvath
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* de6df1re
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* ErikEk
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* Eugene Siegel
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* Martin Habovstiak
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* Oliver Gugger
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* xanoni
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* Yong Yu
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* Zero-1729
