Trust & lifecycle plane / Tier 1 / Phase 1
Observability & FinOps
What happened — and what did it cost?
Make any task reconstructable end to end and attribute its cost: OpenTelemetry GenAI spans carrying trace, thread and task IDs, the acting identity, the policy decision and the token spend.
- Distributed tracing across model calls, tool executions, retrieval, memory and agent runs
- Correlation IDs that survive handoffs, queues and human approvals
- Time-travel debugging: replay of prompts, delegations and memory state at failure
- Quality and drift monitoring, including silent-failure detection
- Token metering, budgets, chargeback and cost per successful task
- Agent-versus-human attribution in every log
traces become evaluation cases
incidents and evidence
cost data enforces budgets
platform metrics
inference latency and tokens
agent run spans
tool spans
SRE / Observability platform, with FinOps
- Head of SRE — accountable owner
- Observability engineer — instrumentation and conventions
- SRE — SLOs, alerting, on-call for agent estates
- FinOps analyst — budgets, chargeback, unit economics
- Data engineer — trace pipelines and retention
Architectural recommendation, not a research finding.
Instrument from the first pilot request. Retrofitting correlation IDs after the fact is the most common and most expensive omission in this whole composition.
Signals to watch
- Trace completeness — share of tasks fully reconstructable
- Share of incidents replayable from telemetry alone
- Cost per successful task and budget burn rate
- Agent-versus-human attribution coverage in logs
- Mean time to detect a silent quality regression
- Classic APM is blind to the failures that matter here: infinite loops, hallucinated queries, silent quality decay
- Roughly 47% of deployed agents are actively monitored; about 68% of organisations cannot distinguish agent from human activity in their logs
- Missing correlation IDs, so an incident cannot be replayed or turned into a test
- Token spend discovered at the invoice rather than in the budget
Tool and standards snapshot · last reviewed approximately mid-2026
Open source
- OpenTelemetry with GenAI semantic conventions
- Langfuse
- Arize Phoenix
- OpenLLMetry
- Grafana, Tempo, Loki, Prometheus
- Jaeger
- OpenCost for infrastructure cost
Managed
- Datadog LLM Observability
- MLflow Tracing
- Cloud-native agent observability services
Standards
- OpenTelemetry GenAI semantic conventions (around v1.41; agent-orchestration and MCP-tool spans still draft — design correlation IDs that survive the spec settling)
- FOCUS cost schema
- W3C Trace Context
OpenTelemetry is the data plane only: it records, it does not judge. Pair it with the evaluation harness or you will have perfect traces of a system nobody can say is working.
