Define SLIs and burn-rate alerts using Honeycomb's native SLO feature

Verified steps

1. Create a Calculated Field containing a boolean expression that defines your SLI (e.g. requests meeting a latency or success threshold)
2. Create an SLO in the Honeycomb UI (or via the `honeycombio_slo` Terraform resource) referencing that Calculated Field, selecting the dataset(s)/service(s), time period, and target percentage
3. Create a Burn Alert referencing the SLO, choosing exhaustion-time or budget-rate thresholds for when to fire
4. Route the burn alert to a notification channel such as Slack, PagerDuty, or a webhook
5. If managing via Terraform, use a `create_before_destroy` lifecycle on the underlying Calculated Field resource since fields in active use by an SLO can't simply be renamed or deleted
6. Monitor the SLO's burn-down over its evaluation window and adjust the target or SLI definition as traffic patterns change