What are Golden Signals?
Golden signals, told as a story about the four gauges on the control-room wall.
How do you know if the park's OK?Going by feel alone, something slips past.
With 12 rides, you can't watch each one.When a screen has too many numbers, eyes can't keep up.
Just watch four gauges.Wait time, guest count, failed rides, how full — these four are enough.
Three are fine, one's red — that's the signal.Watching all four together shows exactly where the trouble is.
Even all-green gauges don't guarantee everything's fine.A hidden problem needs a closer look with other tools.
Golden signals = instead of watching the whole park, just watch four gauges: wait time, guest count, failed rides, and how full.
Google SRE's four core metrics: latency, traffic, errors, and saturation. Related frameworks are the USE method (utilization, saturation, errors — resource-focused) and the RED method (rate, errors, duration — request-focused).
When grown-ups say it
- Golden signals
- The four gauges. Latency, traffic, errors, saturation — just these four.
- Latency
- How long a guest waits. Too long, and guests get tired of waiting.
- Traffic
- How many guests came today. More isn't bad by itself — it's a baseline to compare against.
- Error rate
- How many tried to ride and couldn't. A rise here needs to be noticed right away.
- Saturation
- How full a ride already is. Best to know before it's completely full.
- USE method
- Another four-letter way to check resources. Utilization, saturation, errors — it looks at the ride itself.
- RED method
- A three-letter way to check requests. Rate, errors, duration — it looks at what guests experience.
- Observability
- Looking deeper than the gauges. Needed when all-green gauges still aren't enough. → the people who keep the park open