# OpenTelemetry Spec Compliance Report

Based on the OpenTelemetry specification v1.53.0, this document outlines how otelmini complies with the spec.

Spec reference: https://opentelemetry.io/docs/specs/otel/

---

## Traces

### TracerProvider

| Requirement | Status | Notes |
|-------------|--------|-------|
| `get_tracer(name, version, schema_url, attributes)` | ✅ | Implemented |
| Return working tracer for invalid names | ✅ | No validation/rejection |
| `shutdown()` | ✅ | Implemented |

### Tracer

| Requirement | Status | Notes |
|-------------|--------|-------|
| `start_span(name, context, kind, attributes, links, start_time)` | ✅ | Implemented including links |
| `start_as_current_span()` | ✅ | Implemented |
| `Enabled()` | ❌ | Not implemented |

### Span

| Requirement | Status | Notes |
|-------------|--------|-------|
| `get_span_context()` | ✅ | Implemented |
| `is_recording()` | ⚠️ | Returns based on status, not end time |
| `set_attribute()` / `set_attributes()` | ✅ | Implemented |
| `add_event()` | ✅ | Implemented |
| `set_status()` | ✅ | Implemented |
| `update_name()` | ✅ | Implemented |
| `end()` | ✅ | Implemented |
| `record_exception()` | ⚠️ | Basic impl, doesn't set exception.* attributes |
| `AddLink()` after creation | ❌ | Not implemented |

### SpanProcessor

| Requirement | Status | Notes |
|-------------|--------|-------|
| `on_start()` | ✅ | Implemented |
| `on_end()` | ✅ | Implemented |
| `shutdown()` | ✅ | Implemented |
| `force_flush()` | ✅ | Implemented |

### SpanExporter

| Requirement | Status | Notes |
|-------------|--------|-------|
| `export(batch)` | ✅ | Implemented |
| `shutdown()` | ✅ | Default in base class |
| `force_flush()` | ✅ | Default in base class |

### Sampler

| Requirement | Status | Notes |
|-------------|--------|-------|
| `ShouldSample()` | ✅ | Implemented |
| `GetDescription()` | ❌ | Not implemented |
| Built-in samplers | ✅ | AlwaysOn, AlwaysOff, TraceIdRatioBased, ParentBased |

---

## Metrics

### MeterProvider

| Requirement | Status | Notes |
|-------------|--------|-------|
| `get_meter(name, version, schema_url, attributes)` | ✅ | Implemented |
| `shutdown()` | ✅ | Implemented |

### Meter

| Requirement | Status | Notes |
|-------------|--------|-------|
| `create_counter()` | ✅ | Implemented |
| `create_up_down_counter()` | ✅ | Implemented |
| `create_histogram()` | ✅ | Implemented |
| `create_gauge()` | ✅ | Implemented |
| `create_observable_counter()` | ✅ | Implemented |
| `create_observable_gauge()` | ✅ | Implemented |
| `create_observable_up_down_counter()` | ✅ | Implemented |

### Instruments

| Requirement | Status | Notes |
|-------------|--------|-------|
| `Counter.add(value, attributes)` | ✅ | Aggregates by attribute combination |
| `UpDownCounter.add(value, attributes)` | ✅ | Aggregates by attribute combination |
| `Histogram.record(value, attributes)` | ✅ | Aggregates by attribute combination |
| `Gauge.set(value, attributes)` | ✅ | Last value per attribute combination |
| `Enabled()` on instruments | ❌ | Not implemented |

### MetricReader

| Requirement | Status | Notes |
|-------------|--------|-------|
| `collect()` | ✅ | Via `force_flush()` |
| `shutdown()` | ✅ | Implemented |
| `force_flush()` | ✅ | Implemented |

### MetricExporter

| Requirement | Status | Notes |
|-------------|--------|-------|
| `export(batch)` | ✅ | Implemented |
| `force_flush()` | ✅ | Implemented |
| `shutdown()` | ✅ | Implemented |

### Aggregations

| Requirement | Status | Notes |
|-------------|--------|-------|
| Sum | ✅ | For Counter/UpDownCounter/ObservableCounter/ObservableUpDownCounter |
| Gauge | ✅ | For Gauge/ObservableGauge |
| Histogram | ✅ | Explicit bucket |
| ExponentialHistogram | ❌ | Not implemented |
| Drop | ❌ | Not implemented |

---

## Logs

### LoggerProvider

| Requirement | Status | Notes |
|-------------|--------|-------|
| `get_logger(name, version, schema_url, attributes)` | ✅ | Implemented |
| `shutdown()` | ✅ | Implemented |
| `force_flush()` | ❌ | Not implemented |

### Logger

| Requirement | Status | Notes |
|-------------|--------|-------|
| `emit(log_record)` | ⚠️ | Takes Python LogRecord, not OTel LogRecord |
| `Enabled(severity, context)` | ❌ | Not implemented |

### LogRecord Fields

| Requirement | Status | Notes |
|-------------|--------|-------|
| timestamp | ✅ | Implemented |
| observed_timestamp | ✅ | Implemented |
| trace_id/span_id | ✅ | Captures current span context |
| severity_number/text | ✅ | Implemented |
| body | ✅ | Implemented |
| attributes | ✅ | Implemented |
| resource | ✅ | Included in log export |

### LogRecordProcessor

| Requirement | Status | Notes |
|-------------|--------|-------|
| `on_emit()` | ⚠️ | Uses `on_end()` from BatchProcessor |
| `shutdown()` | ✅ | Implemented |
| `force_flush()` | ✅ | Implemented |

### LogRecordExporter

| Requirement | Status | Notes |
|-------------|--------|-------|
| `export(batch)` | ✅ | Implemented |
| `force_flush()` | ✅ | Implemented |
| `shutdown()` | ✅ | Implemented |

---

## Resource

| Requirement | Status | Notes |
|-------------|--------|-------|
| SDK-provided default attributes | ⚠️ | Has `telemetry.sdk.*`, `service.name` but missing others |
| `OTEL_RESOURCE_ATTRIBUTES` env var | ✅ | Implemented |
| Resource merge operation | ✅ | Implemented |
| `schema_url` support | ✅ | Implemented |
| Immutability | ❌ | Resource is mutable |

---

## Context & Propagation

| Requirement | Status | Notes |
|-------------|--------|-------|
| TextMapPropagator interface | ✅ | Implemented in `propagator.py` |
| `inject()` | ✅ | Implemented |
| `extract()` | ✅ | Implemented |
| W3C TraceContext propagation | ✅ | `traceparent` header supported |
| W3C Baggage propagation | ✅ | Implemented |

---

## Baggage

| Requirement | Status | Notes |
|-------------|--------|-------|
| Baggage API | ✅ | Uses `opentelemetry.baggage` from opentelemetry-api |
| Baggage propagation | ✅ | `BaggagePropagator` in `propagator.py` |

---

## Auto-Instrumentation

| Requirement | Status | Notes |
|-------------|--------|-------|
| CLI entry point | ✅ | `otel` command via `otelmini.distro:auto_instrument` |
| Automatic provider setup | ✅ | TracerProvider, MeterProvider, LoggerProvider |
| Instrumentor discovery | ✅ | Via `opentelemetry_instrumentor` entry points |
| Automatic library instrumentation | ✅ | All installed instrumentors activated |

---

## Summary

| Signal | Compliance | Notes |
|--------|-------------|-------|
| **Traces** | ~90% | Core functionality works, missing AddLink after creation |
| **Metrics** | ~90% | All instruments implemented, missing ExponentialHistogram |
| **Logs** | ~75% | Core functionality implemented |
| **Context/Propagation** | ✅ | W3C TraceContext and Baggage implemented |
| **Baggage** | ✅ | API from opentelemetry-api, propagation implemented |
| **Resource** | ~70% | Merge and env var support added |
| **Auto-Instrumentation** | ✅ | CLI and instrumentor discovery implemented |

---

## High-Impact Gaps

None currently identified.
