Changelog for QGIS 3.30
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* Breaking Changes : Drop project backward compatibility for symbology with QGIS 3.16 and older

* Map Tools : Raster MapTips

* Map Tools : Identify on mouse move, no mouse click

* User Interface : Constraint based functionality for attribute tables

* User Interface : Additional GPS information panel and toolbar fields

* User Interface : GPS Information Panel UX and Refactoring

* Symbology : Improved SLD Export Options

* Rendering : Global map terrain shading

* Rendering : Add super and subscript support for text renderer

* 3D Features : Limit 2D extent of 3D scene

* 3D Features : Improved camera control

* Print Layouts : Shortcuts manager in print layouts

* Print Layouts : Use text renderer in layout legends

* Expressions : Add feature_id() function

* Expressions : New is_feature_valid() and is_attribute_valid() functions

* Expressions : Add x_at, y_at, z_at, m_at expression functions

* Data Management : DateTime Field editing: segregation of display format and field value format

* Data Management : Add option to directly log GPS points and tracks to a Geopackage or Spatialite db

* Data Management : Add an explicit "Offset from UTC" option for storing GPS feature timestamps

* Data Management : Raster Attribute Tables (RAT) Suppport

* Metadata and Metasearch : Add key dates to layer and project metadata

* Forms and Widgets : Audiovisual multimedia attribute attachments support

* Forms and Widgets : Data defined editable state for form widgets

* Forms and Widgets : Spacer widget for drag & drop attribute forms

* Forms and Widgets : Dynamic text widgets with current_value support

* Forms and Widgets : Dynamic HTML widgets with current_value support

* Forms and Widgets : Multiple selections with filtering in value relation widget

* Layer Legend : New layer ordering improvements

* Processing : Additional options for XYZ Tile exports when using Leaflet html output

* Processing : Support data defined parameter values when using qgis_process tool

* Processing : New "load_layer" function

* Processing : Add user interface for extent definition in GDAL Raster Calculator

* Application and Project Options : Add option to store selected GPS component in geometry M values

* Application and Project Options : Make GPS track destination layer an explicit user choice, remember in project

* Profile Plots : New elevation profile canvas item for QGIS Quick

* Profile Plots : Elevation profile plots in print layouts

* Browser : Add dataset relationship editing and creation capabilities in browser

* Data Providers : Removal of Native GeoNode Provider

* Data Providers : In data source manager, allow users to directly add an XYZ   tile layer without having to create a connection first

* Data Providers : SQL Logging for OGR Provider

* Data Providers : S3 Cloud Storage Support

* Data Providers : Resolution aware WMTS layers with automatic upscaling

* Data Providers : Drop unmaintained SAGA provider from QGIS installations

* Data Providers : WFS provider: Improve support of layers with unknown geometry types

* QGIS Server : QGIS_APPLICATION_FULL_NAME environment variable

* QGIS Server : GeoJSON support for WFS DescribeFeatureType

* Plugins : Topology checker rules enabling/disabling and filtering

* Programmability : QgsExifTools Improvements

* Programmability : Smart bracket autocomplete updates for Code Editors

* Programmability : Add "toggle comment" action to the integrated python console

* Notable Fixes : Bug fixes by Even Rouault

* Notable Fixes : Bug fixes by Alessandro Pasotti

* Notable Fixes : Bug fixes by Julien Cabieces

* Notable Fixes : Bug fixes by Sandro Santilli

* Notable Fixes : Bug fixes by Harrissou Sant-anna / Sandro Santilli

* Notable Fixes : Bug fixes by Jean Felder

* Notable Fixes : Bug fixes by Jacky Volpes

* Notable Fixes : Bug fixes by Stefanos Natsis

* Notable Fixes : Bug fixes by Nyall Dawson

* Notable Fixes : Bug fixes by David Signer