Minor release with the following improvements and bug fixes:

Major Improvements:

• Migration to JDK 11;
• Rule Engine:
  • Added "calculate delta" rule node;
  • Added "current customer" and "current tenant" dynamic source types to DeviceProfile key filter. See examples 6 and 7;
  • Added kafka consumer-groups statistics. See rule engine troubleshooting for more info;
  • Attributes cache. See Performance enhancement;
• UI:
  • Added "Entity Count" datasource for widgets;
  • Added "Entity Type" alias. See usage in the "Entity count data source" example [here](https://thingsboard.io/docs/user-guide/dashboards/#2-widget-data-source-types;
  • Added support of common intervals and time zones to the time window selector;
  • Ability to set up a home dashboard for users instead of default "Home" view;
  • Improved "add widget" dialog. Added description and preview images for widgets and widget bundles;
  • Added column visibility and row style functions for table widgets;
  • UI: Improved dashboard load performance by optimizing widget header template.
• Transport:
  • Support of Protobuf for CoAP transport;
  • Support of Efento devices for CoAP transport;

Improvements:

• Core:
  • Added usage statistics configuration to yml file;
  • Added support Phone Number's SID or Messaging Service SID for Twilio SMS provider;
  • Add HTTP cookie repository to store oauth2 authorization requests;
  • Added support for RSA encrypted keys in PEM client credentials;
  • Fix DAO layer to save the newest record with the same timestamp. Enabled updates for old time-series data.
  • Updated version of dependencies to fix vulnerabilities;
• Rule Engine:
  • Added ability to use the pattern to substitute variables from data in rule nodes;
  • Constant filters for device profile;
  • Process alarm rules on activity and inactivity events;
  • Push entity created event to the device profile rule chain and corresponding queue;
  • Added ability to get customer details by the user in the 'customer details' rule node;
  • Script rule node supports split of the incoming message to multiple outcoming messages;
• Transport:
  • Added support of BigDecimal to the JsonConverter;
  • Use msg queue from device profile instead of default;
• UI:
  • Improved load and update time in the time series table;
  • Improved alarm tabs in the entity details: default time interval 30 days;
  • Dynamic color point in trip-animation widget;
  • First/Last page-buttons to the tables-paginator;
  • New setting for subscription - reloadOnlyOnDataUpdated;
  • Replaced deprecated PortalInjector;
  • Added entity info for single-entity aliases even if no alarms to display;
  • Added the ability to get the value of a key that contains dots in the name to table widgets;
  • Fix enable/disable user buttons while the user is not activated yet;
  • Added entity names to dialog headers in rule node and widget dialogs;
  • Updated Czech translation;
  • Updated Spanish translation;
  • Login form password visibility;
• Build scripts:
  • Update deb/rpm packages java dep versions. Update JVM options.
  • Added subject alternative names into key generation tool;
  • Refactoring of migration tool for new Thingsboard DB structure;

Bug fixes:

• Core:
  • Fixed race condition in the partition change events;
  • Fixed memory leak in entity data subscription service;
  • Fix TTL telemetry cleanup function for PostgreSQL;
  • Added ping for WS sessions to avoid session close due to inactivity;
  • Fixed creating partitions in PostgreSQL for stale telemetry which partition was already removed according to TTL;
  • Removed redundant queries for the latest values subscriptions;
  • Allow Customer to edit assigned entities;
  • Fixed default values for claiming queue and duration;
  • Fixed API call to get highest alarm severity.
• Rule Engine:
  • Fixed NPE in Rest API Call rule node;
  • Device profile node now uses message timestamp as alarm startTs instead of current time;
  • Memory leak fix for cases when actors fail to initialize or stopped;
  • Fixed TbKafkaNode. Configure directly serializer class for key/values instead of string class name;
  • Handle case when device was removed from DB but message in the queue;
  • Fixed unlimited error messages in TbMsgGeneratorNode;
  • Fixed SAS credentials in IoT hub node;
  • Added lock to avoid 'No such function invoke InternalXXX' exception for embedded JS execution;
  • Fixed outdated data in cleared alarm event;
• UI:
  • Show correct milliseconds value in the table widget;
  • Fixed display of widget action dialog in Safari browser;
  • Fixed fullscreen button in the JS/JSON editor;
  • Added validation of the obtained value from the cell style function;
  • Make file input work properly when there are multiple on page;
  • Removed creationTime corruption during widget update;
  • Validate EntityId before update dashboard state;
  • Fixed text search for queries with reserved characters;
  • Fixed filter preview text at boolean type in alarm rule;
  • Fixed time-series bars tooltip;
  • Fixed widget data keys autocomplete after change data source type;
  • Fixed time-series widget (invoke data updated callback from data aggregator on initial data). Improve widget selector.
  • Fixed entity select component for the current customer;
  • Fixed error on login in assigned default dashboard was deleted;
  • Notify all core services when device is updated;
• Build scripts:
  • Fixed PostgreSQL distribution config in docker files;
  • Update Cassandra to 4.0 in docker files for "tb-cassandra" image;
• Rest client:
  • Fix of incorrect url for getTenantProfiles call;