"HEAL Loop in Action: The Hourly MongoDB Crawl"

Captain's Blog · Entry 7 · 2026-02-20
A dev-environment case study where HEAL detects a repeating database regression, gates release promotion, and drives an evidence-first fix with human and agentics collaboration.

[Bridge Log 15:04 UTC]
DEV anomaly tripwire fired · RELEASE gate shifted to HOLD · COMMS online

Kevin (Architect)

              Dev DB is crawling again. It starts near the top of the hour, then clears in a few minutes. This started after a fresh deploy.
            
Special Field Agent Zerene

              HEAL just published the incident packet. It linked the first anomaly to commit 8f3c2d1 in catalog-api and flagged a new Mongo aggregation path.

              I also want this explicit in the record: contemporaneous correlation does NOT equal causation.
              The pipeline is gating promotion on risk, not declaring blame.
            
Kevin

              Show me what HEAL saw before and during the slowdown.
            
Zerene

              Core telemetry from the event window:
              
                Time (UTC)SignalObservation
15:01mongodb_op_latency_p95> 2.0s spike
15:01mongodb_lock_queue_depth> 40 and climbing
15:02Slow query logNew hourly aggregation signature on events
15:03Query planCOLLSCAN on unbounded window

              Release policy correctly moved dev -> staging to HOLD.
            
Kevin

              Let's fix root cause, not symptoms.
            
Zerene

              Agreed. We patched the query to a bounded window and added a compound index on {tenant_id, created_at} in commit a19be72.

              Next hourly execution stayed healthy, query plan shifted to IXSCAN, and HEAL released the gate to GREEN.
              
                This is the intended loop: detect, identify, assess, HITL gate, remediate, record, resolve, observe, review.

Time (UTC)	Signal	Observation
15:01	`mongodb_op_latency_p95`	> 2.0s spike
15:01	`mongodb_lock_queue_depth`	> 40 and climbing
15:02	Slow query log	New hourly aggregation signature on `events`
15:03	Query plan	`COLLSCAN` on unbounded window

[Bridge Log Close - RAT Anchor #2026-02-20-HEAL-MONGO-CRAWL]

Post-Mission Summary

Theme	HEAL release gating on recurring dev database regressions
Trigger	New Mongo aggregation path introduced an hourly `COLLSCAN` pattern
Gate Action	Promotion from `dev` to `staging` set to HOLD pending validation
Fix	Bounded query window + compound index + regression guardrail test
Outcome	Hourly cycle re-tested clean; gate transitioned to GREEN; promotion unblocked
Participants	Kevin Broderick (Architect), Special Field Agent Zerene
Status	DEV stable, release gate green, incident recorded for HEAL memory
MTTD	~1 minute (15:01 first anomaly signal to incident packet publication)
MTTC	~2 minutes (15:01 anomaly detection to 15:03 validated `COLLSCAN` root-cause class)
MTTR	~59 minutes (15:01 event start to 16:00 healthy hourly rerun and gate release)

"Evidence drives action; correlation starts the investigation, validation closes it."
- Special Field Agent Zerene

References

HEAL Pipeline ADR v2.0.0 (internal architecture baseline)
HEAL Pipeline DDR v0.1.0 (8-phase operating loop and safety model)
Case study source: HEAL dev MongoDB regression scenario (internal design record)
Prompt Run Log (Entry 7 build/update trace)
HEAL Infographic Poster v1.1 (opens in a new window)

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Validation Controls:
- RAT Anchor binding present and stable
- Timeline evidence captured in this entry and bridge logs
- Commit references recorded for investigative traceability

RAT Anchor ID: RAT-ACE-LOG-7-HEAL-MONGO-CRAWL
Prompt Run Log RAT Anchor ID: RAT-ACE-LOG-7-PROMPT-RUNLOG
Generated At: 2026-02-20 13:16:00 UTC
File Origin: ~/projects/syzygysys.github.io/docs/architects_notebook/log_7.html
Maintainer: SyzygySys Persistence Office
Signed By: Architect Kevin Broderick

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