These Bond Yields previously have moved in a negative area since Investors keep buying those assets. But since the outbreak, Investor seems to ignore safe heaven and hoard cash. They sold Japan and German Bond so those bond yields are increasing since the prices are decreasing.
France Bond Yield is in a negative area which means Investor is still keeping that bond. US Treasury Yield is still positive but Investors believe that the yield soon touches zero-line and enters a negative territory.
I monitor these Yields to measure how investor reacts to the outbreak and possible global recession.
Imagine if US Investors avoid SPX or DJI. That happens when US10Y gives a negative yield.