TraceScope Investigation Report

Field Gateway Connectivity and Telemetry Degradation Investigation

Investigation of degraded behavior observed on field gateway GW-204 at NORTH-RIDGE-17. The session shows two elevated periods involving cellular signal loss, repeated reconnect attempts, Modbus timeouts, telemetry upload failures, queue growth, and delayed backlog processing. Findings focus on the progression from initial connectivity degradation through downstream buffering and worker-stall effects, with the known-good gateway session used as baseline context for comparison.

Generated 2026-10-01T19:30:19.166Z

Sources
2
Comparisons
1
Chronology entries
24
Technical appendix
Included
Cross-Source Evidence

Evidence Chronology

Only timestamped report evidence appears here. Untimestamped evidence remains with its source section.

Show 24 chronology entries
TimestampSourceSeverityMessageContext
2026-08-20T16:10:31.000Zfield-gateway-known-good.logWarningSingle Modbus retry completed successfullyFinding: Resolved, Note
2026-08-20T16:11:03.000Zfield-gateway-degraded.logWarningCellular signal dropped below operating marginFinding: Open, Note, Burst evidence
2026-08-20T16:11:21.000Zfield-gateway-degraded.logWarningCellular uplink reconnect attempt startedBurst evidence
2026-08-20T16:11:39.000Zfield-gateway-degraded.logErrorFlow meter register read timed outBurst evidence
2026-08-20T16:11:57.000Zfield-gateway-degraded.logWarningTelemetry upload retry scheduledBurst evidence
2026-08-20T16:12:15.000Zfield-gateway-degraded.logErrorCellular uplink disconnectedBookmarked, Finding: Open, Note, Burst evidence
2026-08-20T16:12:33.000Zfield-gateway-degraded.logWarningLocal telemetry buffer depth exceeded targetBurst evidence
2026-08-20T16:12:51.000Zfield-gateway-degraded.logErrorSecond flow meter read timed outFinding: Open, Note, Burst evidence
2026-08-20T16:13:09.000Zfield-gateway-degraded.logWarningUpstream synchronization delayed by link instabilityBurst evidence
2026-08-20T16:13:27.000Zfield-gateway-degraded.logWarningGateway began another reconnect attemptBurst evidence
2026-08-20T16:13:45.000Zfield-gateway-degraded.logErrorReconnect attempt failed and link dropped againBookmarked, Finding: Open, Note, Burst evidence
2026-08-20T16:14:03.000Zfield-gateway-degraded.logWarningBuffered flow telemetry queued for retryBurst evidence
2026-08-20T16:25:47.000Zfield-gateway-known-good.logWarningTransient signal dip recovered without disconnectFinding: Resolved, Note
2026-08-20T16:26:36.000Zfield-gateway-known-good.logInfoTelemetry batch uploaded successfullyFinding: Dismissed, Note
2026-08-20T16:28:03.000Zfield-gateway-degraded.logWarningResidual telemetry backlog began growing againFinding: Open, Note, Burst evidence
2026-08-20T16:28:21.000Zfield-gateway-degraded.logWarningBuffered telemetry upload retry scheduledBurst evidence
2026-08-20T16:28:39.000Zfield-gateway-degraded.logErrorBuffered telemetry upload timed outBookmarked, Finding: Open, Note, Burst evidence
2026-08-20T16:28:57.000Zfield-gateway-degraded.logWarningLocal buffer write latency exceeded targetBurst evidence
2026-08-20T16:29:15.000Zfield-gateway-degraded.logWarningTelemetry worker exceeded watchdog timing targetBurst evidence
2026-08-20T16:29:33.000Zfield-gateway-degraded.logErrorSecond buffered upload timed outBurst evidence
2026-08-20T16:29:51.000Zfield-gateway-degraded.logWarningTelemetry buffer continued growing during retriesBurst evidence
2026-08-20T16:30:09.000Zfield-gateway-degraded.logWarningFlow telemetry batch queued behind backlogBurst evidence
2026-08-20T16:30:27.000Zfield-gateway-degraded.logErrorTelemetry worker stalled during backlog drainBookmarked, Finding: Open, Note, Burst evidence
2026-08-20T16:30:45.000Zfield-gateway-degraded.logWarningBuffer persistence remained slower than targetFinding: Resolved, Note, Burst evidence
Immutable Session Comparison

field-gateway-known-good → field-gateway-degraded

Baselinefield-gateway-known-good.logScope: Complete imported session
→
Comparisonfield-gateway-degraded.logScope: Complete imported session
Baseline records
203
Comparison records
222
Record delta
+19
Custom-Field Changes — Categorical Fields
FieldValueBaselineComparisonChange
Firmware3.14.8-rc10222Appeared
Firmware3.14.72030Disappeared
Custom-Field Changes — Numeric Fields
FieldBaselineComparison
Disk Usage (%)min 41 · median 43 · max 46 · n=203min 41 · median 44 · max 46 · n=222
Latency (ms)min 18 · median 34 · max 86 · n=203min 18 · median 34 · max 850 · n=222
Queue Depthmin 2 · median 4 · max 6 · n=203min 2 · median 4 · max 46 · n=222
Reconnect Countmin 0 · median 0 · max 0 · n=203min 0 · median 0 · max 3 · n=222
RSSI (dBm)min -74 · median -65 · max -63 · n=203min -92 · median -65 · max -63 · n=222

This comparison is the immutable analysis captured by the TraceScope comparison document. It was not recalculated from current session state during report generation.

Source Investigation

field-gateway-known-good.log

field-gateway-known-good.log · key-value

Source records
203
Visible records
203
Analysis records
203
Evidence records
3

Analysis populations intentionally ignore annotation-only bookmark and finding-status filters. The visible population preserves the complete current table filter state.

Source Investigation

field-gateway-degraded.log

field-gateway-degraded.log · key-value

Source records
222
Visible records
222
Analysis records
222
Evidence records
21

Analysis populations intentionally ignore annotation-only bookmark and finding-status filters. The visible population preserves the complete current table filter state.