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# Fapilog Documentation Review Report

**Review Date:** January 2026
**Reviewer:** Claude (Documentation Audit)

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## Executive Summary

### Overall Scores

| Metric | Score | Justification |
|--------|-------|---------------|
| **Accuracy** | 6/10 | Several false claims about non-existent sinks; undocumented API functions referenced |
| **Completeness** | 7/10 | Good core API coverage; missing filters API reference; underdocumented plugins |

### Critical Issues Requiring Immediate Action

1. **FALSE: README claims non-existent sinks** - MongoDB, Splunk, Azure Monitor, QRadar, Datadog, Kafka are listed but not implemented
2. **FALSE: Pipeline docs reference non-existent functions** - `get_pipeline_metrics()` and `get_pipeline_health()` don't exist
3. **MISSING: No filters API reference** - `docs/api-reference/plugins/filters.md` doesn't exist despite 6 built-in filters
4. **INCOMPLETE: Sinks/Enrichers tables** - Only 3 of 10 sinks and 2 of 3 enrichers documented in API reference

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## 1. Claim Audit

### False Claims (Must Remove/Fix)

| Location | Claim | Reality | Action |
|----------|-------|---------|--------|
| README.md:243 | "Database sinks (PostgreSQL, MongoDB)" | Only PostgresSink exists | Remove MongoDB |
| README.md:244 | "Cloud services (AWS CloudWatch, Azure Monitor)" | Only CloudWatch exists | Remove Azure Monitor |
| README.md:245 | "SIEM integration (Splunk, ELK, QRadar)" | None implemented | Remove entire line |
| README.md:265 | "Splunk/Elasticsearch/Loki/Datadog/Kafka" | Only Loki exists | Clarify as roadmap |
| pipeline-architecture.md:264 | `get_pipeline_metrics()` | Function doesn't exist | Remove example |
| pipeline-architecture.md:274 | `get_pipeline_health()` | Function doesn't exist | Remove example |

### Verified Claims

| Location | Claim | Evidence |
|----------|-------|----------|
| README.md:13 | Python 3.8+ | `pyproject.toml:34` confirms |
| README.md:52-57 | Async-first, plugin-friendly | Architecture confirmed |
| README.md:101-106 | Preset table accurate | `core/presets.py` matches |
| Top-level functions | get_logger, get_async_logger, runtime, runtime_async | `__init__.py` exports all |

### Partially Correct

| Location | Claim | Issue |
|----------|-------|-------|
| ~~installation.md:52-56~~ | ~~"Python 3.9+ recommended, 3.8 limited"~~ | ✅ **RESOLVED** - See ADR-001 in `architecture/decisions/001-drop-python-3.9-support.md` |
| api-reference/plugins/index.md | Sinks table | Lists 3 of 10 actual sinks |
| api-reference/plugins/enrichers.md | Enrichers list | Missing KubernetesEnricher |

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## 2. Feature Coverage Gaps

### Undocumented Public Features

| Feature | Code Location | Documentation Status |
|---------|---------------|---------------------|
| **KubernetesEnricher** | `plugins/enrichers/kubernetes.py` | Not documented |
| **AdaptiveSamplingFilter** | `plugins/filters/adaptive_sampling.py` | Not documented |
| **TraceSamplingFilter** | `plugins/filters/trace_sampling.py` | Not documented |
| **FirstOccurrenceFilter** | `plugins/filters/first_occurrence.py` | Not documented |
| **LoggerBuilder** | `builder.py` | Mentioned but no API docs |
| **AsyncLoggerBuilder** | `builder.py` | Mentioned but no API docs |

### Under-Documented Features

| Feature | Issue |
|---------|-------|
| ~~CloudWatchSink~~ | ~~Only env vars documented, no API reference~~ | ✅ **RESOLVED** |
| ~~LokiSink~~ | ~~Only env vars documented, no API reference~~ | ✅ **RESOLVED** |
| ~~PostgresSink~~ | ~~Only env vars documented, no API reference~~ | ✅ **RESOLVED** |
| AuditSink | Only in enterprise docs, not in main API reference |
| RoutingSink | Only in user guide, not in API reference |
| WebhookSink | Mentioned briefly, lacks configuration details |

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## 3. Documentation Quality Issues

### P0 (Actively Misleading)

1. Users searching for MongoDB/Splunk/Azure sinks will find nothing
2. Code examples in pipeline docs will throw `ImportError`
3. Missing filters docs leaves users without sampling/rate-limit guidance

### P1 (Confusing/Incomplete)

1. ~~Python version messaging inconsistent between README and installation docs~~ ✅ **RESOLVED**
2. Sinks documentation scattered across multiple locations
3. No clear distinction between stable and experimental features

### P2 (Polish)

1. Enrichers API doc ends with stray text: "*** End Patch"
2. Links to non-existent `docs/examples/index.md` in user-guide
3. Some env var tables missing defaults

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## 4. Recommended Actions

### Immediate (P0)

1. **Edit README.md** - Remove false sink claims
2. **Edit pipeline-architecture.md** - Remove non-existent function examples
3. **Create filters.md** - New API reference for all 6 filters
4. **Update sinks table** - Add all 10 implemented sinks
5. **Update enrichers table** - Add KubernetesEnricher

### Next Sprint (P1)

1. ~~Align Python version messaging~~ ✅ **RESOLVED**
2. ~~Add CloudWatch/Loki/Postgres to sinks API reference~~ ✅ **RESOLVED**
3. Create builder API reference
4. Add troubleshooting section

### Backlog (P2)

1. Consolidate sink routing docs
2. Add migration guide from stdlib logging
3. ~~Add architectural decision records~~ ✅ **RESOLVED** - See `docs/architecture/decisions/`

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## 5. Actual Feature Inventory (from code)

### Sinks (10 total)
- stdout_json, stdout_pretty, rotating_file, http, webhook
- cloudwatch, loki, postgres, audit, routing

### Enrichers (3 total)
- runtime_info, context_vars, kubernetes

### Redactors (3 total)
- field_mask, regex_mask, url_credentials

### Filters (6 total)
- level, sampling, rate_limit
- adaptive_sampling, trace_sampling, first_occurrence

### Processors (2 total)
- zero_copy, size_guard

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## 6. Files Requiring Edits

| File | Edit Type | Priority |
|------|-----------|----------|
| `README.md` | Remove false claims | P0 |
| `docs/core-concepts/pipeline-architecture.md` | Remove non-existent examples | P0 |
| `docs/api-reference/plugins/filters.md` | CREATE NEW FILE | P0 |
| `docs/api-reference/plugins/index.md` | Update tables | P0 |
| `docs/api-reference/plugins/enrichers.md` | Add k8s enricher | P0 |
| ~~`docs/api-reference/plugins/sinks.md`~~ | ~~Add CloudWatch/Loki/Postgres~~ | ✅ **RESOLVED** |
| ~~`docs/getting-started/installation.md`~~ | ~~Align Python version~~ | ✅ **RESOLVED** |

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*Report generated by automated documentation audit. All findings verified against source code.*
