Threshold Buffer
grid_tools
QgsProcessingParameterRasterLayer|FEATURES|Features Grid|None|False
QgsProcessingParameterRasterLayer|VALUE|Value Grid|None|False
QgsProcessingParameterRasterLayer|THRESHOLDGRID|Threshold Grid|None|True
QgsProcessingParameterNumber|THRESHOLD|Threshold|QgsProcessingParameterNumber.Double|0.0|False|None|None
ParameterSelection|THRESHOLDTYPE|Threshold Type|[0] Absolute;[1] Relative from cell value
OutputRaster|BUFFER|Buffer Grid