API Health
HTTP availability probes classify response status, timeout behavior, retry response, and service window stability.
- Status class aggregation
- Timeout and retry markers
- Service availability windows
Signal classes
Infrastructure observation grid
StackRadar groups alpha telemetry into specific signal classes for regional availability, path consistency, resolver behavior, and incident review.
Edge Latency
Regional observation points track p50, p95, and short-window drift against alpha baselines.
- p95 response tracking
- Regional latency chips
- Confidence weighted sampling
Route Drift
Path movement is reduced into consistency markers for review across consecutive observation windows.
- Path movement scoring
- Regional consistency deltas
- Incident timeline markers
TLS Surface
Endpoint observation records handshake timing, certificate rotation windows, and response classification.
- Handshake timing windows
- Certificate metadata checks
- Endpoint availability markers
Synthetic Checks
Scheduled probes generate controlled availability snapshots for selected API and infrastructure surfaces.
- Probe cadence control
- HTTP response classification
- Regional sample grouping
Incident Windows
Events are grouped into reduced degradation, recovery, and confidence windows for incident review.
- Degradation grouping
- Recovery markers
- Confidence deltas
DNS Resolver Variance
Resolver behavior is sampled for lookup timing, answer-set variance, and regional differences.
- Resolver response windows
- Answer-set instability
- Lookup timing variance
ASN Path Sampling
Reduced path samples support infrastructure review when regional movement exceeds expected thresholds.
- ASN sequence comparison
- Sampling confidence score
- Route consistency review