Implement multiwindow multi-burn-rate SLO alerting for error budget management

Steps

1. Define the SLO error rate and target availability as recording rules that compute the ratio of bad events to total events
2. Calculate burn-rate as the ratio of the current error rate to the acceptable steady-state error rate derived from the SLO target
3. Create a fast-burn alert using a short window (such as 1 hour) and high burn-rate threshold to catch sudden outages
4. Create a slow-burn alert using a longer window (such as 6 hours or 3 days) and a lower burn-rate threshold to catch gradual degradation
5. Require both the short and long windows to be above threshold simultaneously to reduce false positives from transient spikes