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Reliability · Version 1.5.0 · Reviewed 2026-08-02

Synthetic Monitoring Designer

Reduce production risk in journey selection and check design with evidence, explicit trade-offs, and a verification plan.

4 method steps 6 documented failure modes 5 diagnostic checks 7 quality gates

Designs synthetic checks that exercise real user journeys and fail for reasons worth waking someone.

₹149 one-time

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What this skill helps you do

  • Journey selection
  • Check design
  • False positive control

How Synthetic Monitoring Designer works

You provide

Current signals, alert rules, and recent incidents

It inspects

Symptom-versus-cause coverage for journey selection

It decides

A check design design with bounded label cardinality

You verify

Each page has a documented action and a real trigger

What it checks first

Synthetic Monitoring Designer designs synthetic checks that exercise real user journeys and fail for reasons worth waking someone. Use it when the work involves Journey selection, Check design, False positive control.

  1. Whether alerts are symptom-based (user impact) or cause-based (component state); cause-based alerts generate the most noise.
  2. Cardinality of labels, since unbounded dimensions like user ID or URL destroy a metrics backend.
  3. Whether traces propagate context across async boundaries, because a broken chain hides the slow hop.
  4. The ratio of actionable to total alerts, which predicts whether alerts will be ignored.
  5. Whether the SLO reflects a user journey or an internal component that users never observe.

Failure modes it recognizes

  • Alert fatigue where a noisy alert trains responders to ignore the channel that later carries a real outage.
  • Metric cardinality explosion from a label containing a request ID, causing ingestion cost and query failure.
  • Sampled traces dropping exactly the slow requests that needed investigation.
  • Logs without correlation IDs, making a multi-service request impossible to reconstruct.
  • A dashboard averaging latency, which hides the tail where user pain actually lives.
  • An alert on a threshold that only fires after the error budget is already exhausted.

Answers it will reject

  • Alerting on CPU utilization, which is a resource state rather than user impact and fires without consequence.
  • Adding a dashboard instead of an alert, which requires a human to be watching to be useful.
  • Logging at debug level in production to "have the data", which costs more than the incidents it solves.
  • Reporting availability as a mean, which allows a total regional outage to disappear into the average.

Decision rules it applies

  • Alert on symptoms that users feel; use cause metrics for diagnosis, not for paging.
  • Every page must have a documented action; if the action is "look at it", it is not a page.
  • Measure latency with percentiles and always include p99, since averages hide the tail.
  • Keep label cardinality bounded and known; treat an unbounded dimension as a defect.

Evidence it asks for

  • Define an SLI as a ratio of good events to valid events, with both terms explicitly specified.
  • Use tail-based sampling so slow and failed traces are retained preferentially.
  • Propagate a correlation ID from edge to database and include it in every log line.

The method inside

  1. Turn journey selection into explicit functional requirements and quality-attribute constraints.
  2. Model the critical path, state, trust, and failure boundaries that govern check design.
  3. Compare viable designs for false positive control against weighted constraints and operational ownership.
  4. Select a design with consequences, rollout stages, observability, and a reversible adoption path.

Deliverables

  • Journey selection assessment
  • Check design decision and action plan
  • False positive control verification checklist

Evidence requirements

  • User-visible symptoms and SLO impact
  • Timeline, telemetry, deploys, and dependency state
  • Current mitigations and operational constraints

Quality gates

  • Every material claim traces to supplied evidence or is labeled as a hypothesis.
  • The response follows the declared deliverable contract.
  • No execution, access, measurement, or verification is invented.
  • Secrets and personal data are redacted rather than repeated.
  • The user receives a concrete independent verification step.
  • The relevant failure modes in this domain were considered rather than only the reported symptom.
  • No listed anti-pattern was recommended as a solution.

Example task

Input

Our uptime check passes while customers cannot log in, because it only pings the health endpoint.

Expected output

A health endpoint proves the process is running, not that the product works, which is exactly the gap you hit. Synthesize the actual login journey including the identity provider, and alert on the journey rather than on any single component...

Boundaries and compatibility

Ideal for

  • Journey selection: produce a decision or artifact grounded in supplied evidence.
  • Check design: produce a decision or artifact grounded in supplied evidence.
  • False positive control: produce a decision or artifact grounded in supplied evidence.

Out of scope

  • Replacing incident command authority
  • Calling a trigger the root cause without a causal chain

Agent compatibility

  • GitHub Copilot custom agents
  • Claude Agent Skills / SKILL.md
  • Any instruction-following chat model

Tool policy: Advisory by default. No tools are assumed. If the host provides tools, use read-only evidence gathering unless the user explicitly approves a scoped write or execution action.