[mmu probing] pr04.probe: Add observer pattern for metrics tracking

tests/saitests/probe/observer_config.py

@@ -0,0 +1,44 @@
+"""
+Observer Configuration - Type-safe configuration using dataclass
+
+Provides type-safe configuration for ProbingObserver instances.
+Prevents field name typos and provides IDE autocomplete support.
+"""
+
+from dataclasses import dataclass
+from typing import Dict, Optional
+
+
+@dataclass
+class ObserverConfig:
+    """
+    Type-safe configuration for ProbingObserver
+
+    This dataclass ensures compile-time field validation and prevents
+    configuration errors through IDE autocomplete and type checking.
+
+    Attributes:
+        probe_target: Target type being probed (e.g., "pfc_xoff", "ingress_drop")
+        algorithm_name: Name of the probing algorithm
+        strategy: Algorithm strategy description
+        check_column_title: Check column title (e.g., "PfcXoff", "IngDrop")
+        context_template: Optional template for iteration context info
+            (e.g., " [{probe_target} upper bound: {window_upper}]")
+        completion_template: Template string for completion message
+        completion_format_type: Format type for completion message ("value" or "range")
+        table_column_mapping: Mapping of table columns to data fields
+    """
+
+    probe_target: str
+    algorithm_name: str
+    strategy: str
+    check_column_title: str
+    context_template: Optional[str] = None
+    completion_template: Optional[str] = None
+    completion_format_type: str = "value"
+    table_column_mapping: Optional[Dict[str, Optional[str]]] = None
+
+    def __post_init__(self):
+        """Initialize default values for mutable fields"""
+        if self.table_column_mapping is None:
+            self.table_column_mapping = {}