Service mesh migration readiness evidence synthesis for architecture review¶

Canonical pattern(s): Research synthesis with citation verification Source Markdown: instances/engineering/service-mesh-migration-readiness-evidence-synthesis-for-architecture-review.md

Linked pattern(s)¶

research-synthesis-with-citation-verification

Domain¶

Engineering.

Scenario summary¶

A platform engineering architecture review board is preparing a gate review for migrating customer-facing microservices from legacy sidecar proxies to a managed service mesh control plane. Before anyone approves migration waves, updates production standards, or schedules cutovers, the workflow needs a cited readiness brief showing which reliability assumptions, dependency constraints, rollback prerequisites, security-control requirements, performance baselines, and unresolved adoption risks are actually supported by the current source set. The useful output is an evidence-backed synthesis that separates verified readiness facts from stale design assumptions, conflicting operational signals, and open questions that still require service-owner or security review.

flowchart TD A["Scope the migration-readiness question and approved engineering source boundary"] --> B["Gather current readiness evidence RFCs, service catalog data, telemetry, load tests, rollback drills, incidents, and security standards"] B --> C["Build the cited readiness synthesis separate verified facts, stale assumptions, conflicting signals, and open questions"] C --> D{"Verification checks citation validity, source precedence, recency, service and dependency scope, rollback evidence, and security-control coverage"} D --> E["Publish the verified readiness brief with evidence trace for architecture review"] D --> F["Hold the workflow for missing rollback proof, unresolved traffic-policy dependencies, or source conflicts"] F --> G["Bounded handoff for resolution service owner, platform reviewer, or security reviewer only"] G --> B E --> H["Bounded handoff to downstream review migration-wave approval, standards updates, or cutover scheduling"]

Target systems / source systems¶

Architecture decision record archive, platform RFC repository, and mesh adoption design docs
Service catalog with ownership metadata, dependency maps, and ingress or egress policy inventories
SLO dashboards, latency and error-budget reports, and production capacity review artifacts for candidate services
Load-test results, canary evaluation notes, rollback drill records, and release-readiness checklists
Incident postmortems, exception register entries, and known-issue trackers related to proxying, certificate rotation, or traffic policy failures
Security standards repository, approved control baselines, and policy-as-code results for mTLS, identity, and network segmentation

Why this instance matters¶

This grounds the gather/synthesize pattern in an engineering workflow where the key need is a traceable readiness brief rather than a migration recommendation or an execution plan. Platform migrations often accumulate partial evidence across RFCs, benchmark notes, postmortems, and service-owner exceptions that do not carry equal authority or recency. The value comes from assembling a source-ranked synthesis that lets reviewers inspect what is verified, what is merely proposed, and which readiness claims are still unsupported before any production migration decision moves downstream.

Likely architecture choices¶

flowchart LR architecture["Architecture records decision archive, RFCs, and mesh design docs"] -->|"approved architecture baseline"| synth["Tool-using synthesis agent for migration-readiness brief assembly"] service["Service inventory and traffic-policy sources service catalog, dependency maps, and ingress or egress policy inventories"] -->|"service scope and dependency context"| synth operations["Operational readiness evidence SLO dashboards, latency reports, error budgets, and capacity reviews"] -->|"observed production behavior"| synth testing["Controlled test and rollback evidence load tests, canary notes, rollback drills, and release-readiness checklists"] -->|"performance baselines and rollback prerequisites"| synth controls["Exception and security-control sources postmortems, exception register entries, known-issue trackers, security standards, and policy-as-code results"] -->|"exceptions and control coverage"| synth synth -->|"writes claim-to-source mappings, source precedence, and open questions"| trace["Readiness brief and evidence trace verified facts, stale assumptions, conflicting signals, and open questions"] trace -->|"submits review-ready synthesis"| review["Human-in-the-loop review source-boundary decisions and conflicting readiness-signal interpretation"] review -->|"accepts reviewed brief for architecture review"| output["Reviewed readiness brief for architecture review"] review -->|"holds for missing rollback proof, unresolved traffic-policy dependencies, or source conflicts"| hold["Hold state service-owner or security review needed"]

A tool-using single agent can retrieve approved architecture records, operational evidence, test artifacts, and policy results, then draft a structured synthesis with claim-to-source mappings.
Human-in-the-loop review should remain mandatory for source-boundary decisions, interpretation of conflicting readiness signals, and any conclusion that could influence production migration approval.
The workflow should preserve an evidence trace that distinguishes binding platform standards, observed production behavior, controlled test evidence, and lower-authority planning assumptions.
Retrieval should stay within approved engineering, security, and reliability repositories; unsupported inference about migration safety, team capacity, or rollback sufficiency should be blocked.

Governance notes¶

Current platform standards, approved RFC decisions, and production telemetry should outrank slide decks, chat summaries, or stale planning notes when sources disagree.
The brief should clearly separate verified prerequisites, observed service readiness evidence, temporary exceptions, and open questions instead of flattening them into one migration narrative.
Source timestamps and environment scope should be explicit because superseded load tests or outdated dependency maps can make readiness look stronger than it is.
Open questions should remain visible for items such as missing rollback drill evidence, incomplete certificate-rotation coverage, or unresolved east-west traffic-policy dependencies.
Access to incident artifacts, topology data, and security findings should follow least-privilege rules, with copied excerpts minimized to what reviewers need to inspect each cited claim.

Evaluation considerations¶

Percentage of material readiness, rollback, security-control, and performance-baseline claims backed by inspectable citations to the current approved source set
Reviewer correction rate for source precedence, recency handling, dependency scoping, or citation mismatch during architecture review
Rate at which stale benchmarks, undocumented service exceptions, or conflicting operational evidence are surfaced explicitly before migration-wave approval
Usefulness of the open-questions section for helping platform, service-owner, and security reviewers close readiness gaps without reconstructing the source corpus from scratch