FAILURE IS A STATE
A dependency can be healthy, pressured, isolated, recovering, or verified. MODLAN makes that operating state explicit.
MODLAN V79 · RELIABILITY ENGINEERING
Enterprise systems should fail deliberately.
V79 gives the V78 workflow plane a reliability vocabulary for duplicate protection, bounded retry, queue failure, dependency isolation, degraded-mode behavior, workflow liveness, service-objective pressure, and controlled replay.
RETRY IS A POLICY
Retries are bounded, attributable, and limited to operations that are safe to retry. Infinite retry is not resilience.
RECOVERY PRESERVES TRACE
Replay and recovery retain correlation and disposition context so restoration does not erase the history of failure.
DEGRADED ≠ HEALTHY
Alternate behavior is labeled as degraded operation rather than silently presenting partial capability as normal service.
V79 · RELIABILITY COMMAND CENTER
See failure. Contain failure. Recover with evidence.
Exercise synthetic failure scenarios against MODLAN's reliability control vocabulary. This public surface generates no production traffic, writes no operational record, and connects to no customer environment.
SYNTHETIC SERVICE STATENOMINALEXTERNAL API
NOMINALPRESSURECONTAINEDRECOVERY
FAILURE SCENARIO
Partner API latency spike
Timeout pressure. Expected controls illuminate below so operators can reason about containment and recovery as a system rather than a collection of unrelated alerts.
RELIABILITY TRACEEPHEMERAL / SYNTHETIC
01Synthetic reliability fabric initialized — no operational telemetry connected.
CONTROL FABRIC
Eight controls. One operating doctrine.
V79 does not treat reliability features as independent switches. Each control participates in a failure lifecycle from detection through containment, deferred work, recovery, verification, and improvement.
Idempotency Guard
Same mutation key resolves once within the configured replay window.
- FAILURE
- Duplicate side effects / repeated transitions
- RECOVERY
- Return original result or reject conflicting replay
Bounded Retry Policy
Retry only retry-safe operations with capped exponential backoff and jitter.
- FAILURE
- Retry storm / duplicate mutation / dependency pressure
- RECOVERY
- Escalate to deferred or dead-letter state after budget exhaustion
Circuit Breaker
Open the circuit when dependency health crosses the configured threshold.
- FAILURE
- Cascading dependency failure
- RECOVERY
- Probe in half-open state before restoring normal traffic
Dead-Letter Control
Failed work is isolated with reason, attempt count, correlation reference, and review state.
- FAILURE
- Poison message blocks queue or disappears silently
- RECOVERY
- Inspect, correct, replay, or disposition with authority
Workflow Heartbeat
Long-running workflow instances emit liveness and progress signals.
- FAILURE
- Stalled work remains invisible
- RECOVERY
- Alert owner, inspect dependency, resume or route exception
Degraded Mode
Preserve safe read, queue, or alternate-path behavior without pretending normal health.
- FAILURE
- Total outage from noncritical dependency
- RECOVERY
- Restore full mode only after health criteria pass
SLO / SLA Timer
Track objective consumption and surface burn before contractual or operational breach.
- FAILURE
- Late detection of service degradation
- RECOVERY
- Escalate, shed nonessential load, rebalance ownership, or activate continuity path
Controlled Replay
Replay requires correlation, idempotency protection, reason, and explicit disposition.
- FAILURE
- Unsafe manual rerun creates inconsistent state
- RECOVERY
- Re-execute from a known checkpoint with trace preservation
V78 + V79
Workflow now has a failure model.
V78 defined governed state progression. V79 defines what should happen when commands repeat, dependencies fail, queues poison, workflows stall, or recovery must replay work safely.
NEXT BUILD
V80 can normalize enterprise information architecture.
With interaction, workflow, and reliability planes established, V80 can normalize object taxonomy, workspaces, navigation, role pathways, commands, and deep-link semantics across the platform.