Latency SLO
A latency SLO measures the fraction of checks that returned below a response-time threshold. Applies to http_check monitors only.
Computation
The SLO holds when the fraction of checks under the threshold is at least the target percentile divided by 100:
latency_slo = fraction_of_checks_below_threshold ≥ target_percent / 100Setting target_percent = 95 and threshold = 500 requires p95 ≤ 500 ms over the rolling window.
Configuration
Open the monitor edit form and scroll to SLO Settings. Latency fields:
latency_threshold_ms— Threshold (ms)- Response-time ceiling in milliseconds. Checks under this value are counted as fast. Tunable per monitor on every plan.
latency_target_pct— Target percentile (%)- Minimum fraction of checks that must complete under the threshold.
95means 95% of checks must be fast. Business and Founder only; defaults to 95. latency_excluded_regions— Excluded regions- Per-region toggle. Excluded regions still run checks and contribute to availability; their response times are removed from the latency aggregate and burn-rate math. Business and Founder only.
Latency panel
- Current p95
- p95 over the full SLO window (default 7 days). Drives the error-budget calculation.
- Recent p95 (1 h)
- p95 over the last hour. Reacts quickly to recent changes — deploys, traffic spikes, regional network events.
A rising Recent p95 that has not moved Current p95 indicates a recent change that has not yet affected the budget.
Per-region breakdown
Below the main latency card, a grid shows p95 per probe region. Excluded regions are tagged with an excluded badge; their p95 is still displayed for reference. Regions whose p95 exceeds the threshold are highlighted.
Plan tier matrix
| Capability | Free | Pro | Business | Founder |
|---|---|---|---|---|
| Latency SLO panel and per-region breakdown | ✓ | ✓ | ✓ | ✓ |
latency_burn detector | ✓ | ✓ | ✓ | ✓ |
latency_threshold_ms | ✓ | ✓ | ✓ | ✓ |
latency_target_pct, rolling window, latency_excluded_regions | — | — | ✓ | ✓ |
Defaults applied to Free and Pro: 95% / 500 ms / 7 days. The threshold can be overridden per monitor on every plan.