26 lines
1.9 KiB
Markdown
26 lines
1.9 KiB
Markdown
# gateway-heartbeat-telemetry Specification
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## Purpose
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TBD - created by archiving change phase3c-gateway-audit-remediation. Update Purpose after archive.
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## Requirements
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### Requirement: Heartbeat egress is observed
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Authenticated gateway heartbeat telemetry SHALL calculate egress from monotonic transmitted-byte deltas over monotonic elapsed time and MUST NOT report configured capacity as measured traffic.
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#### Scenario: Controlled byte delta is sampled
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- **WHEN** transmitted bytes increase by a known amount during a known interval
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- **THEN** heartbeat egress equals the measured rate while configured capacity remains a separate registration value
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### Requirement: Required telemetry remains bounded and low cardinality
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The established authenticated path SHALL expose observed bytes, packets, drops, RTT, loss, jitter, queue delay, processing delay, pacing, reconnect, and provider state without session, route, credential, or payload labels.
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#### Scenario: Telemetry snapshot is published
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- **WHEN** the gateway emits a heartbeat after forwarding traffic
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- **THEN** it carries the bounded process-level observations and no high-cardinality or secret-bearing value
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### Requirement: Production delays have disjoint sample semantics
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Queue delay SHALL measure provider-queue residence, processing delay SHALL measure provider recovery plus framing and QUIC handoff work excluding queue and pacing, and pacing delay SHALL measure scheduler waiting only. The gateway SHALL advance processing samples once per complete provider media unit even when it emits multiple Verse frames.
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#### Scenario: Known production waits
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- **WHEN** one provider media unit has controlled enqueue, processing, and pacing intervals and fragments across multiple frames
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- **THEN** each cumulative total reports only its intended interval and exactly one processing sample is retained through authenticated Server persistence
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