Chainweb

This version replaces all previous versions. Any prior version will stop working
on **2022-01-13T00:00:00Z**. Node administrators must upgrade to this version
before that date.

This version will stop working on **2022-02-24T00:00:00Z**.

Changes:

* Upgrade Pact version to 4.2.0. (1323)

* The default setting for pruning the chainweb database has been changed to
"none" to reduce unnecessary work and speed up node start times. (1332)

* Nodes will now take a snapshot of the chainweb database (RocksDB) if sent
the SIGUSR1 signal. These snapshots can be used for backups and do not take
significant space until the database has diverged significantly from the
snapshot. Also, SIGUSR2 no longer terminates the node. (1328)

* Nodes will log their progress while pruning the database. (1315)

* The Pact queue has been instrumented to log its utilization level and
latency. (1284)

This is a minor feature release. It is compatible with version 2.11. Upgrading
optional. Please, check the list of changes before upgrading.

Changes:

* New command line options for configuring mining coordination. The options
`--enable-mining-coordination --mining-public-key=<PUBLIC_KEY>` enable the
mining API of a node and configure `k:<PUBLIC_KEY>` as the account that
receives mining rewards. (1311)

* Include GET endpoints for cuts, headers, branches, and payloads
into the service API. (1309)

* Add configuration for stopping the node after synchronizing the
Pact state to the chain database and before starting connecting to
the P2P network. This is useful to initializing the Pact database
for a new node or validating an existing database. (1312)

* Remove rate limiting support for endpoints of the service API.
Rate limiting for the service API should be done by using an external
reverse proxy. (1300)

* Log filter rules allow fine grained support for controlling
which messages are actually submitted. This version adds the ability to
specify for a filter rule a probability with which a log messages passes the
respective filter rule. This allows to emit only a certain percentage of
message of some kind to the backend. (1300)

This version replaces all previous versions. Any prior version will stop working
on **2021-11-18T00:00:00Z**. Node administrators must upgrade to this version
before that date.

This version will stop working on **2022-01-13T00:00:00Z**.

Changes:

* Add priorities to the pact services queue. This gives consensus and
new block requests priority over requests from the service APIs and the
mempool. It makes nodes more resilient under load. (1280)

* Upgrade Pact version to 4.1.2. (1286, 1287)

* Enforce keyset formats. (1287)

* A new configuration option `chainweb.minGasPrice` (`--min-gas-price`) is
added that configures a minimum gas price for transactions. The mempool
will reject any transactions that doesn't pay at least this amount for
gas. This allows node operators to enforce mindful usage of resources
even when the majority of blocks isn't full. (1282)

The default minimum gas limit is raised from 1e-12 to 1e-8.

* Chainweb node now depends on the OpenSSL library being installed on
the system. (Before it already depended on the OpenSSL root certificates
being available.)

This version replaces all previous versions. Any prior version will stop working
on **2021-10-14T00:00:00Z**. Node administrators must upgrade to this version
before that date.

This version will stop working on **2021-11-18T00:00:00Z**.

There are no changes in this version.

This is a bug fix release. It is recommended that node operators upgrade their
nodes.

This version is fully compatible with previous versions.

Changes:

* Fix a bug where API requests return result pages with more than the upper
limit of items. (1271)

This is a bug fix release. It is recommended that node operators
upgrade their nodes.

This version is fully compatible with previous versions.

Changes:

* Fix a bug that causes mempools to ignore new transactions after receiving
10000 transactions on a chain. (1267)