commit 7c883811f28aa513d957652ef266aa5caaf746cd
Author: Mika <kontakt@donau2space.de>
Date:   Thu Mar 12 11:51:44 2026 +0000

    Add outlier_analysis/src/outlier_analysis/core.py

diff --git a/outlier_analysis/src/outlier_analysis/core.py b/outlier_analysis/src/outlier_analysis/core.py
new file mode 100644
index 0000000..de8f8e4
--- /dev/null
+++ b/outlier_analysis/src/outlier_analysis/core.py
@@ -0,0 +1,106 @@
+from __future__ import annotations
+import logging
+from typing import List, Dict, Any
+import pandas as pd
+from dataclasses import dataclass, asdict
+import statistics
+
+
+logger = logging.getLogger(__name__)
+
+
+@dataclass
+class LogRecord:
+    run_id: str
+    latency_ms: float
+    stratum: str
+    job_parallelism: int
+    retry_total_overhead_ms: float
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'LogRecord':
+        required_fields = {f.name for f in cls.__dataclass_fields__.values()}
+        missing = required_fields - data.keys()
+        if missing:
+            raise ValueError(f"Missing required fields: {missing}")
+        try:
+            return cls(
+                run_id=str(data['run_id']),
+                latency_ms=float(data['latency_ms']),
+                stratum=str(data['stratum']),
+                job_parallelism=int(data['job_parallelism']),
+                retry_total_overhead_ms=float(data['retry_total_overhead_ms'])
+            )
+        except (ValueError, TypeError) as exc:
+            raise ValueError(f"Invalid data in LogRecord: {data}") from exc
+
+
+@dataclass
+class OutlierSummary:
+    run_id: str
+    outlier_count: int
+    latency_distribution: Dict[str, float]
+
+    def to_dict(self) -> Dict[str, Any]:
+        return asdict(self)
+
+
+class OutlierAnalysisError(Exception):
+    """Custom exception for outlier analysis errors."""
+    pass
+
+
+def analyze_outliers(log_data: List[Dict[str, Any]]) -> Dict[str, Any]:
+    """
+    Analysiert Logdaten auf Latenz-Outlier und erzeugt eine summarische Statistik pro Run.
+
+    Parameter:
+        log_data: Liste von Logeinträgen als Dicts.
+
+    Rückgabe:
+        Dict mit Schlüssel = run_id, Wert = OutlierSummary.to_dict()
+    """
+    if not isinstance(log_data, list):
+        raise OutlierAnalysisError("Input log_data must be a list of dicts.")
+
+    try:
+        records = [LogRecord.from_dict(item) for item in log_data]
+    except ValueError as e:
+        logger.error("Data validation failed: %s", e)
+        raise OutlierAnalysisError(str(e))
+
+    df = pd.DataFrame([asdict(r) for r in records])
+    if df.empty:
+        return {}
+
+    summaries: Dict[str, Any] = {}
+
+    for run_id, group in df.groupby('run_id'):
+        latencies = group['latency_ms']
+        p50 = float(latencies.quantile(0.5))
+        p95 = float(latencies.quantile(0.95))
+        p99 = float(latencies.quantile(0.99))
+        max_latency = float(latencies.max())
+
+        # Define outliers as latency > p99
+        outlier_mask = latencies > p99
+        outlier_count = int(outlier_mask.sum())
+
+        latency_distribution = {
+            'p50': round(p50, 3),
+            'p95': round(p95, 3),
+            'p99': round(p99, 3),
+            'max': round(max_latency, 3)
+        }
+
+        summary = OutlierSummary(
+            run_id=str(run_id),
+            outlier_count=outlier_count,
+            latency_distribution=latency_distribution
+        )
+        summaries[str(run_id)] = summary.to_dict()
+
+        logger.debug("Processed run_id=%s: %s", run_id, summary)
+
+    assert all('run_id' in s for s in summaries.values()), 'Validation: Missing run_id in summary.'
+    return summaries
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