In May and November of each year, provincial emergency management organizations conduct public alerting tests across Canada. In order to capture some reception and feedback statistics from the public, surveys are regularly conducted and the results are available here https://peasi.com/survey-results/
More information for members of the public who receive emergency alerts.
Map of broadcasters participating in Alert Ready
CRTC Report on mobile phone Alert Volume and Do-Not-Disturb settings
National Public Alerting System 