add doc strings for method implementations

Author: edoyango

src/access/parsers/payujson_profiling.py

@@ -35,9 +35,26 @@ def __init__(self):
 
     @property
     def metrics(self) -> list:
+        """Implements "metrics" abstract method/property.
+
+        Returns:
+            list: the metric names captured by this parser.
+        """
         return self._metrics
 
     def read(self, stream: str) -> dict:
+        """Implements "read" abstract method to parse a JSON file generated by Payu.
+
+        Args:
+            stream (str): String containing valid JSON to be parsed.
+
+        Returns:
+            dict: Parsed timing information.
+
+        Raises:
+            KeyError: when "timings" key is missing in input JSON.
+            ValueError: if stream is not a string with valid JSON.
+        """
 
         try:
             timings = json.loads(stream)["timings"]