Fix on observability metrics + code refactor

src/artifact_translation_package/databricks_job.py

@@ -9,6 +9,22 @@
 import json
 from typing import List, Dict, Any, Optional
 from pathlib import Path
+
+# Load .env file for local development only (skip on Databricks)
+def _is_local_env() -> bool:
+    """Check if running locally (not on Databricks)."""
+    return not (
+        "DATABRICKS_RUNTIME_VERSION" in os.environ or 
+        os.path.exists("/databricks")
+    )
+
+if _is_local_env():
+    try:
+        from dotenv import load_dotenv
+        load_dotenv()
+    except ImportError:
+        pass  # python-dotenv not installed
+
 from artifact_translation_package.utils.output_utils import make_timestamped_output_path, is_databricks_env
 from artifact_translation_package.utils.sql_file_writer import save_sql_files
 from artifact_translation_package.utils.result_saver import save_results

src/artifact_translation_package/graph_builder.py

@@ -25,6 +25,10 @@
 from artifact_translation_package.utils.types import ArtifactBatch, TranslationResult
 from artifact_translation_package.utils.observability import initialize, finalize, get_observability
 from artifact_translation_package.utils.logger import LogLevel
+from artifact_translation_package.utils.result_merger import (
+    create_empty_result,
+    merge_result_into,
+)
 
 
 class TranslationState(TypedDict):
@@ -326,6 +330,10 @@ def __init__(self, run_id: Optional[str] = None, log_level: LogLevel = LogLevel.
 
     def run(self, batch: ArtifactBatch) -> Dict[str, Any]:
         """Process a single batch through the translation graph."""
+        # Reset metrics for this batch to prevent accumulation across runs
+        if self.obs:
+            self.obs.get_metrics().reset()
+
         self.logger.info("Starting translation graph execution", context={
             "artifact_type": batch.artifact_type,
             "batch_size": len(batch.items)
@@ -361,109 +369,7 @@ def run(self, batch: ArtifactBatch) -> Dict[str, Any]:
             summary = finalize()
             raise
 
-    def _initialize_merged_result(self) -> Dict[str, Any]:
-        """
-        Initialize empty merged result structure.
-
-        Returns:
-            Dictionary with empty result structure
-        """
-        return {
-            "databases": [],
-            "schemas": [],
-            "tables": [],
-            "views": [],
-            "stages": [],
-            "external_locations": [],
-            "streams": [],
-            "pipes": [],
-            "roles": [],
-            "grants": [],
-            "tags": [],
-            "comments": [],
-            "masking_policies": [],
-            "udfs": [],
-            "procedures": [],
-            "metadata": {
-                "total_results": 0,
-                "errors": [],
-                "processing_stats": {}
-            }
-        }
 
-    def _merge_result_into(
-        self,
-        merged_result: Dict[str, Any],
-        result: Dict[str, Any]
-    ) -> None:
-        """
-        Merge a single result into the merged result structure.
-
-        Args:
-            merged_result: The merged result dictionary to update
-            result: A single result dictionary to merge
-        """
-        for key, value in result.items():
-            if key == "metadata":
-                merged_result["metadata"]["total_results"] += result["metadata"].get("total_results", 0)
-                merged_result["metadata"]["errors"].extend(result["metadata"].get("errors", []))
-                merged_result["metadata"]["processing_stats"].update(result["metadata"].get("processing_stats", {}))
-            elif key == "observability":
-                # Merge observability data
-                if "observability" not in merged_result:
-                    merged_result["observability"] = {
-                        "run_id": value.get("run_id"),
-                        "total_duration": 0,
-                        "total_errors": 0,
-                        "total_warnings": 0,
-                        "total_retries": 0,
-                        "artifact_counts": {},
-                        "stages": {},
-                        "ai_metrics": {}
-                    }
-
-                obs = merged_result["observability"]
-
-                # Aggregate artifact_counts
-                for artifact_type, count in value.get("artifact_counts", {}).items():
-                    obs["artifact_counts"][artifact_type] = obs["artifact_counts"].get(artifact_type, 0) + count
-
-                # Aggregate total_errors, total_warnings, total_retries
-                obs["total_errors"] += value.get("total_errors", 0)
-                obs["total_warnings"] += value.get("total_warnings", 0)
-                obs["total_retries"] += value.get("total_retries", 0)
-
-                # Merge stages (aggregate items_processed, error_count and duration)
-                for stage_name, stage_data in value.get("stages", {}).items():
-                    if stage_name not in obs["stages"]:
-                        obs["stages"][stage_name] = stage_data.copy()
-                    else:
-                        # Aggregate metrics
-                        obs["stages"][stage_name]["items_processed"] += stage_data.get("items_processed", 0)
-                        obs["stages"][stage_name]["error_count"] += stage_data.get("error_count", 0)
-
-                        # Aggregate duration if present
-                        if "duration" in stage_data and stage_data["duration"] is not None:
-                            current_duration = obs["stages"][stage_name].get("duration", 0) or 0
-                            obs["stages"][stage_name]["duration"] = current_duration + stage_data["duration"]
-
-                # Merge ai_metrics
-                for ai_key, ai_data in value.get("ai_metrics", {}).items():
-                    if ai_key not in obs["ai_metrics"]:
-                        obs["ai_metrics"][ai_key] = ai_data
-                    else:
-                        # Aggregate AI metrics
-                        obs["ai_metrics"][ai_key]["call_count"] += ai_data.get("call_count", 0)
-                        obs["ai_metrics"][ai_key]["total_latency"] += ai_data.get("total_latency", 0)
-                        obs["ai_metrics"][ai_key]["errors"] += ai_data.get("errors", 0)
-                        # Recalculate average latency
-                        if obs["ai_metrics"][ai_key]["call_count"] > 0:
-                            obs["ai_metrics"][ai_key]["average_latency"] = (
-                                obs["ai_metrics"][ai_key]["total_latency"] /
-                                obs["ai_metrics"][ai_key]["call_count"]
-                            )
-            elif key in merged_result:
-                merged_result[key].extend(value)
 
     def run_batches(self, batches: List[ArtifactBatch]) -> Dict[str, Any]:
         """
@@ -486,10 +392,10 @@ def run_batches(self, batches: List[ArtifactBatch]) -> Dict[str, Any]:
                 all_results.append(result)
 
         if all_results:
-            merged_result = self._initialize_merged_result()
+            merged_result = create_empty_result()
 
             for result in all_results:
-                self._merge_result_into(merged_result, result)
+                merge_result_into(merged_result, result)
 
             # Calculate total duration
             end_time = time.time()

src/artifact_translation_package/nodes/aggregator.py

@@ -48,12 +48,19 @@ def aggregate_translations(*results: TranslationResult, evaluation_results: Opti
             if result.errors:
                 merged["metadata"]["errors"].extend(result.errors)
 
-            # Update processing stats
-            merged["metadata"]["processing_stats"][artifact_type] = {
-                "count": len(result.results),
-                "errors": len(result.errors),
-                **result.metadata
-            }
+            # Update processing stats - accumulate if artifact_type already exists
+            if artifact_type in merged["metadata"]["processing_stats"]:
+                # Accumulate counts for same artifact type across batches
+                existing = merged["metadata"]["processing_stats"][artifact_type]
+                existing["count"] = existing.get("count", 0) + len(result.results)
+                existing["errors"] = existing.get("errors", 0) + len(result.errors)
+                existing["processed"] = existing.get("processed", 0) + result.metadata.get("processed", len(result.results))
+            else:
+                merged["metadata"]["processing_stats"][artifact_type] = {
+                    "count": len(result.results),
+                    "errors": len(result.errors),
+                    **result.metadata
+                }
 
             merged["metadata"]["total_results"] += len(result.results)
 

src/artifact_translation_package/utils/metrics.py

@@ -68,7 +68,15 @@ def __init__(self):
         """Initialize metrics collector."""
         if self._initialized:
             return
+        self.reset()
+        self._initialized = True
+
+    def reset(self):
+        """Reset all metrics for a new run.
 
+        This should be called at the start of each translation run to ensure
+        metrics don't accumulate across runs.
+        """
         self.run_id: Optional[str] = None
         self.start_time: float = time.time()
         self.end_time: Optional[float] = None
@@ -82,7 +90,6 @@ def __init__(self):
         self.total_retries: int = 0
 
         self.logger = get_logger("metrics")
-        self._initialized = True
 
     def set_run_id(self, run_id: str):
         """Set run ID for this execution."""

src/artifact_translation_package/utils/observability.py

@@ -44,8 +44,9 @@ def __init__(
 
         self.logger = get_logger("observability", level=log_level, handlers=handlers)
 
-        # Setup metrics
+        # Setup metrics - reset to clear any accumulated state from previous runs
         self.metrics = get_metrics_collector()
+        self.metrics.reset()
         self.metrics.set_run_id(self.run_id)
 
         self.logger.info("Observability initialized", context={"run_id": self.run_id})