Adds a 5 s polling collector that publishes BullMQ queue depth as the
goodgo_queue_depth gauge (labels: queue, state) and a
goodgo_queue_job_outcomes_total counter for processor hooks. The collector
fails-soft on Redis errors so a queue blip cannot crash the app.
- New constants: QUEUE_DEPTH_GAUGE, QUEUE_JOB_OUTCOMES_TOTAL,
QUEUE_METRICS_QUEUE_NAMES (extend as Phase 2 adds queues)
- New QueueMetricsCollector with injectable timer/clock for tests
- MetricsModule.withQueueMetrics() dynamic module wires queue tokens via
getQueueToken + factory provider; re-imports BullModule.registerQueue so
ordering between MetricsModule and feature modules does not matter
- AppModule mounts MetricsModule.withQueueMetrics() alongside MetricsModule
- 4 unit tests cover sample → gauge mapping, Redis-down fail-soft,
recordJobOutcome, and timer init/destroy
Bull Board UI mount split into WS3b (needs @bull-board/* deps).
Refs: GOO-175
Co-Authored-By: Paperclip <noreply@paperclip.ing>
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