Backpressure & Retry Configuration Page

[ElioNeto]

Backpressure & Retry Configuration Page

Create an Angular page for monitoring backpressure signals and configuring retry/backoff policies using the existing backpressure and retry infrastructure.

Backend Endpoints Needed

GET    /admin/backpressure/status       — Current backpressure level (none, mild, severe, critical)
GET    /admin/backpressure/metrics      — Backpressure metrics (queue depths, wait times)
GET    /admin/retry/config              — Current retry/backoff configuration
PUT    /admin/retry/config              — Update retry/backoff config
GET    /admin/retry/stats               — Retry statistics (attempts, successes, failures)

UI Requirements

Backpressure Monitor

• Gauge: Current backpressure level with color coding
  • Green: None
  • Yellow: Mild
  • Orange: Severe
  • Red: Critical
• Queue Depths: Memtable flush queue, compaction queue, write queue
• Wait Times: Average wait time for operations
• Trend: Mini sparkline chart showing backpressure over last 60s

Retry Configuration

• Max Retries: Number input (0 = no retry)
• Base Delay: Duration input (ms)
• Backoff Multiplier: Float input (e.g., 2.0 for exponential)
• Max Delay: Maximum delay cap
• Retryable Errors: Which error types should be retried

Retry Statistics

• Success Rate: % of retries that succeeded
• Attempts Distribution: Chart showing attempts per operation
• Recent Retries: Table with timestamp, operation, attempts, final result

Acceptance Criteria

• Backpressure gauge shows current level
• Queue depths display correctly
• Retry config can be viewed and updated
• Retry statistics show success/failure rates
• Error states for API failures

Parent Epic

#290

[ElioNeto]

Resolved via feat/notes-engine-v2 branch (PR #321)