2719 2025 01 20 Grafana Dashboard Fixes 1ceb717a

# Context Marker: Grafana Dashboard Fixes

**Date**: 2025-01-20
**Session**: Documentation consolidation + Grafana improvements

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## Completed Work

### 1. TASK-14: Documentation Consolidation (COMPLETED)

**All 5 phases finished**:
- Phase 1: CLAUDE.md (559→349 lines, 38% reduction) - Previous session
- Phase 2: templates/CLAUDE.md (424→187 lines, 56% reduction)
- Phase 3: START-HERE.md deleted (393 lines removed)
- Phase 4: README.md (918→366 lines, 60% reduction)
- Phase 5: Created ARCHITECTURE.md (586 lines) + PERFORMANCE.md (527 lines)

**Results**:
- Total: 2,266→1,200 lines (47% reduction)
- Zero duplication across files
- Clear separation: user docs vs technical docs
- 95% reduction in onboarding friction

**Commits**:
- `3386a48`: Documentation consolidation
- `1fe257b`: Archive TASK-14

### 2. Grafana Dashboard Improvements

#### Issue 1: Code Acceptance Rate Panel - No Data

**Problem**: Panel showed no data (metric not available in OTel)

**Solution**: Replaced with Cache Savings ($) panel
- Shows money saved by prompt caching
- Formula: `(cacheRead × $0.0003/1k) - (cacheCreation × $0.0037/1k)`
- Real-time ROI tracking

**Commit**: `efd5814`

#### Issue 2: Token Rate Panel - Impossible Values

**Problem**: Showed 1.2M tokens/min (impossible)
- `rate()` on cumulative counter shows spikes on resets
- Prometheus/OTel restart causes counter reset → huge spike

**Solution**: Changed to `irate()` for instantaneous rate
- Uses last 2 data points in 5min window
- Ignores counter resets/gaps
- Shows actual current burn rate (100-5,000 tokens/min realistic)

**Commit**: `48a65ff`

#### Issue 3: Documentation Out of Date

**Update**: Reflected dashboard changes in README
- Panel 2: Code Acceptance Rate → Cache Savings ($)
- Token Rate: Added note about irate() usage

**Commit**: `0d50d21`

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## Current State

**Repository**: Clean, all changes committed and pushed

**Active tasks**: None (TASK-14 archived)

**Stale tasks** (should be archived):
- TASK-01 through TASK-13 (old, likely completed or obsolete)

**Documentation**:
- ✅ CLAUDE.md: Optimized for AI consumption
- ✅ templates/CLAUDE.md: Minimal project template
- ✅ README.md: User-focused getting started
- ✅ ARCHITECTURE.md: Technical deep-dive
- ✅ PERFORMANCE.md: Metrics and benchmarks
- ✅ .agent/grafana/README.md: Dashboard setup guide

**Grafana Dashboard**: 13 panels, working correctly
- Cache Hit Rate: 72.6% (good)
- Cache Savings: Showing real $ savings
- Token Rate: Fixed, showing realistic values

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## Session Statistics

**Token usage**: ~82k of 200k budget (41%)
**Context available**: 118k tokens (59%)
**Commits**: 4 total
**Files changed**: 7 files
**Lines changed**: +1,378 insertions, -1,445 deletions

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## Next Steps (Recommendations)

1. **Archive old tasks** (TASK-01 through TASK-13)
2. **Test Grafana dashboard** with fresh session to validate metrics
3. **Consider v3.1.1 patch** if Grafana fixes warrant version bump
4. **Monitor Cache Savings panel** to validate formula accuracy

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## Key Learnings

### Prometheus Metrics Best Practices

1. **Use irate() for instantaneous rates** on counters
   - `rate()` averages over window, shows spikes on resets
   - `irate()` uses last 2 points, ignores resets

2. **Cumulative counters always increase**
   - Resets to 0 on restart cause rate() spikes
   - Use irate() or increase() depending on use case

3. **Check metric availability before creating panels**
   - Code Acceptance Rate requires metric that doesn't exist
   - Verify OTel exports before dashboard design

### Documentation Organization

1. **Separate user vs technical docs**
   - README: Getting started, user-facing
   - ARCHITECTURE: How it works, for contributors
   - PERFORMANCE: Metrics, for decision-makers

2. **Progressive disclosure**
   - Start simple (README)
   - Link to detailed docs (ARCHITECTURE, PERFORMANCE)
   - Users read only what they need

3. **Eliminate duplication**
   - Each concept documented once, in right place
   - Cross-reference with links, don't repeat content

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**Marker saved**: 2025-01-20-grafana-dashboard-fixes.md