yeah it's not a great design. It could easily be a line graph where the the vertical axis is a log scale representation of each day's uptime . You'd still be able to tell at a glance which services are stable (top marks across the board) and which services have dips. you could even still have the line change colors when it dips below a certain range if you just really wanted colors on it. it would even zoom infinitely* since the horizontal axis can be arbitrary buckets of time, and the vertical axis is always 0%-100% uptime

• down to whatever your health check interval is, at which point the graph would just alternate between 0% and 100%, and up to the full lifetime of the service. still, it could be nice for analyzing some service failures.