Enum MotifClass 

pub enum MotifClass {
    MemoryLeakDrift,
    CascadingTimeoutSlew,
    DeploymentRegressionSlew,
    CacheDegradationGrazing,
    ConnectionPoolExhaustionDrift,
    GcPressureOscillation,
    ErrorRateEscalation,
    DependencySlowdown,
    ResourceSaturation,
    QueueBackpressure,
    RetryStormCascade,
    CircuitBreakerOpenShift,
    DatabaseLockContention,
    AuthenticationFailureSpike,
    ConfigDriftRegression,
    PacketLossErrorEscalation,
    NetworkDelayDependencyInflation,
    DiskIoSaturation,
    CpuSaturation,
    JvmHeapPressure,
    JvmGcPause,
    ServiceGraphDriftPropagation,
    HighDimAnomalyCluster,
    MetricCorrelationCollapse,
    LogVolumeAnomaly,
    LogTraceTemporalDecorrelation,
    LogSeverityEscalation,
    SaturationTrending,
    EpisodicTransientSpike,
    RegressiveDriftWithRecovery,
    EnvelopeBoundaryApproach,
    EnvelopeBreach,
}

Motif classes for software debugging — Paper §5.6.

Names are anchored to IEEE 24765 vocabulary and the Avizienis–Laprie–Randell dependability tree (fault → error → failure). No ad-hoc terminology: every variant decomposes into established software-engineering vocabulary.

Variants

MemoryLeakDrift

Sustained monotonic memory-consumption drift. IEEE 24765: “memory leak”; A-L-R: latent fault → error.

CascadingTimeoutSlew

Step-change latency propagating across dependency chain. IEEE 24765: “fault propagation”; A-L-R: error → service-failure.

DeploymentRegressionSlew

Abrupt shift coinciding with deployment event. IEEE 24765: “regression”; A-L-R: design fault → error.

CacheDegradationGrazing

Oscillatory approach to latency SLO boundary. IEEE 24765: “performance degradation”; A-L-R: marginal-state error.

ConnectionPoolExhaustionDrift

Slow positive drift in queue depth + latency. IEEE 24765: “resource exhaustion”; A-L-R: error build-up.

GcPressureOscillation

Periodic slew events from garbage collection. IEEE 24765: “stop-the-world pause”; A-L-R: transient error.

ErrorRateEscalation

Sustained positive drift in error rate. IEEE 24765: “error escalation”; A-L-R: error → multi-failure regime.

DependencySlowdown

Gradual latency increase in upstream dependency. IEEE 24765: “performance degradation upstream”; A-L-R: external fault.

ResourceSaturation

CPU/memory/disk approaching ceiling. IEEE 24765: “resource saturation”; A-L-R: latent → manifest fault.

QueueBackpressure

Message queue depth growing monotonically. IEEE 24765: “back-pressure accumulation”; A-L-R: error build-up.

RetryStormCascade

Retry-storm cascade: client retries amplify upstream load. Evidence: TADBench retry-storm fault case. IEEE 24765: “retry-induced amplification”; A-L-R: cascading error.

CircuitBreakerOpenShift

Circuit breaker open-state shift; downstream calls return immediately. Evidence: TADBench circuit-breaker fault case. IEEE 24765: “fault tolerance mechanism state change”.

DatabaseLockContention

Database lock contention with rising queue + latency. Evidence: TADBench db-lock fault case. IEEE 24765: “concurrency fault”; A-L-R: synchronisation error.

AuthenticationFailureSpike

Authentication failure spike (auth-backend partial outage). Evidence: TADBench auth-fail fault case. IEEE 24765: “authentication subsystem failure”.

ConfigDriftRegression

Step shift coinciding with version-config change. Evidence: TrainTicket-Anomaly version-config fault class. IEEE 24765: “configuration regression”; A-L-R: design-time fault.

PacketLossErrorEscalation

Packet-loss-induced error escalation (network-layer fault). Evidence: AIOps Challenge packet_loss category. IEEE 24765: “communication failure (lower layer)”.

NetworkDelayDependencyInflation

Network-delay-induced upstream latency inflation. Evidence: AIOps Challenge network_delay category. IEEE 24765: “communication-path performance fault”.

DiskIoSaturation

Disk-I/O saturation; concave-up latency drift. Evidence: AIOps Challenge disk_exhaustion category. IEEE 24765: “storage subsystem saturation”.

CpuSaturation

CPU saturation; latency drift with rising envelope occupancy. Evidence: AIOps Challenge cpu_exhaustion category. IEEE 24765: “compute resource saturation”.

JvmHeapPressure

JVM heap pressure; sustained latency drift with rising variance. Refines MemoryLeakDrift for JVM-specific signatures. Evidence: AIOps Challenge memory_exhaustion category.

JvmGcPause

JVM GC pause: distinct stop-the-world latency spikes. Refines GcPressureOscillation for JVM-specific signatures. Evidence: AIOps Challenge jvm_resource_exhaustion category.

ServiceGraphDriftPropagation

Drift propagating along the service-call graph (multi-hop). Evidence: MultiDim-Localization root-cause-graph cases. IEEE 24765: “graph-structured fault propagation”.

HighDimAnomalyCluster

Multi-metric correlated anomaly without dominant single signal. Evidence: MultiDim-Localization high-dim cluster cases. IEEE 24765: “compound fault signature”.

MetricCorrelationCollapse

Historically-correlated metrics decorrelate; structural regime shift. Evidence: MultiDim-Localization correlation-collapse cases. IEEE 24765: “structural model invalidation”.

LogVolumeAnomaly

Log-frequency outward drift on a service. Evidence: DeepTraLog log-volume anomalies. IEEE 24765: “diagnostic-output anomaly”.

LogTraceTemporalDecorrelation

Log timing departs from trace timing pattern. Evidence: DeepTraLog log-trace temporal-mismatch cases. IEEE 24765: “instrumentation-temporal divergence”.

LogSeverityEscalation

Log severity distribution shifts (more WARN/ERROR proportionally). Evidence: DeepTraLog severity-shift cases. IEEE 24765: “diagnostic severity escalation”.

SaturationTrending

Concave-up approach to a ceiling; generalises ResourceSaturation. IEEE 24765: “asymptotic resource saturation”.

EpisodicTransientSpike

Short-duration high-slew event that self-resolves. IEEE 24765: “transient-only error”; A-L-R: transient fault.

RegressiveDriftWithRecovery

Outward drift followed by return to baseline. Refines ReasonCode::DriftWithRecovery into a motif class. IEEE 24765: “self-healing transient drift”.

EnvelopeBoundaryApproach

First-time approach to the admissibility envelope without recurrence or persistent drift evidence. Catches the ReasonCode::BoundaryApproach reason code so it isn’t an orphan in the canonical bank (validated by tests::no_orphan_reason_codes_in_canonical_bank). IEEE 24765: “marginal-state transient”; A-L-R: dormant fault.

EnvelopeBreach

Envelope breach without abrupt slew evidence — the “value stepped past the threshold but the trajectory shape shows no slew” case. Catches the ReasonCode::EnvelopeViolation reason code so it isn’t an orphan in the canonical bank. IEEE 24765: “threshold breach (smooth)”; A-L-R: error → manifest.

Trait Implementations

impl Clone for MotifClass

fn clone(&self) -> MotifClass

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for MotifClass

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for MotifClass

fn eq(&self, other: &MotifClass) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for MotifClass

impl Eq for MotifClass

impl StructuralPartialEq for MotifClass