No, you cannot customize the graph.
SORACOM Harvest graph has below characteristics.
- Graph axes are determined automatically based on the data sent to Harvest. You cannot customize these values or labels
- You can select which element to display by clicking graph legends
- Double clicking the graph legend will display only double clicked element
- Turning on Auto refresh(5 sec) will plot new data every 5 seconds
- Harvest graph only displays 100 elements. When auto refreshing, it sometimes displays more than 100 elements.