A single expression is able to cover multiple alert statements. E.g. `ts(cpu.loadavg.1m) > 50` will alert any time a system that is reporting cpu.loadavg.1m exceeds 50. This will cover all metrics in that namespace, and alerts communicate the tags that the offending system had on it.
Alternately, you can manage your alerts via API (documentation found here: Wavefront API | Wavefront ). This would make it easier to manage multiple alerts all at once.