Discussion Prompt: What existing national security legislation, new bulk analysis efforts, and emergency measures have different states deployed to curb the spread of Covid-19?

We are facing a global health emergency. Governments around the world have responded by making use of existing contingency plans in their public health and emergency laws but also turned to new measures to slow the spread of the pandemic. What changes to the legal framework, policy, and use of surveillance has Covid-19 triggered across different states? Are these changes necessary and what can be said about their democratic legitimacy? What legal and technical safeguards are being addressed or should become the norm to render surveillance-based government responses to the health crisis proportionate?