[memory utilization] update memory threshold (#19167)

What is the motivation for this PR?
There are so many memory above threshold alarm in nightly test

How did you do it?
Update the FRR memory threshold and make the alarm more readable

memory_increase_threshold, FRR has it's own memory management system, not return the memory to system immediately, increase the threshold.
1: top:zebra: update from 64 to 128M
2: frr_bgp: update from 32 to 64M
3: frr_zebra: update from 16 to 64M

memory_high_threshold, frr bgp memory usage related to the count of neighbors, increase the threshold. we need to set the threshold according to the count of neighbors in the further.
1: frr_bgp: update from 128 to 256M

How did you verify/test it?
Run nightly test
https://elastictest.org/scheduler/testplan/685ac58d2461750d1f5a11c9

Author: lipxu

tests/common/plugins/memory_utilization/README.md

@@ -35,6 +35,30 @@ The memory utilization plugin automatically monitors memory resources and genera
 
 ## Plugin Design
 
+### Memory Utilization Plugin Summary
+
+The memory utilization plugin for SONiC testing automatically monitors memory usage on the Device Under Test (DUT) before and after each test. Its main goals are to ensure that memory usage does not exceed configured thresholds and to detect memory leaks or abnormal increases during test execution.
+
+**Key Features:**
+- **Automatic Monitoring:** Runs for all tests unless explicitly disabled.
+- **Configurable Thresholds:** Uses JSON files to define memory checks, commands, and thresholds (absolute values or percentages).
+- **Multiple Monitors:** Supports system memory, process memory, docker containers, and FRR daemons.
+- **Flexible Scope:** Allows global, HWSKU-specific, and test-specific configuration.
+- **Failure Reporting:** Fails tests with detailed messages if thresholds are exceeded.
+
+**How It Works:**
+1. **Pre-test:** Collects baseline memory usage using configured commands and parsers.
+2. **Post-test:** Collects memory usage again and compares with baseline.
+3. **Validation:** Checks if usage exceeds high thresholds or if increase is above allowed limits.
+4. **Reporting:** Fails the test if any check fails, with clear diagnostics.
+
+**Configuration:**
+- Thresholds can be absolute values, percentages, or both (the strictest applies).
+- Can be disabled globally or per-test.
+- Easily extendable for new memory monitors or custom thresholds.
+
+This plugin helps maintain system stability and quickly identifies memory-related issues during SONiC test runs.
+
 ### Configuration Files
 
 The plugin uses two JSON configuration files:

tests/common/plugins/memory_utilization/memory_utilization.py

@@ -49,18 +49,16 @@ def check_memory_thresholds(self, current_values, previous_values):
         logger.debug("Current values: {}".format(current_values))
 
         for name, cmd, memory_params, memory_check_fn in self.commands:
-            logger.debug("Checking thresholds for command: {}".format(name))
-
             for mem_item, thresholds in memory_params.items():
-                logger.debug("Processing memory item: {}".format(mem_item))
+                logger.info("Checking thresholds for command: {}-{}".format(name, mem_item))
 
                 # Convert thresholds to structured format for consistency
                 logger.debug("Original thresholds: {}".format(thresholds))
                 normalized_thresholds = self._normalize_thresholds(thresholds)
                 logger.debug("Normalized thresholds: {}".format(normalized_thresholds))
 
-                current_value = float(current_values.get(name, {}).get(mem_item, 0))
-                previous_value = float(previous_values.get(name, {}).get(mem_item, 0))
+                current_value = round(float(current_values.get(name, {}).get(mem_item, 0)), 1)
+                previous_value = round(float(previous_values.get(name, {}).get(mem_item, 0)), 1)
 
                 if current_value == 0 or previous_value == 0:
                     logger.warning("Skipping memory check for {}-{} due to zero value".format(name, mem_item))
@@ -102,7 +100,17 @@ def check_memory_thresholds(self, current_values, previous_values):
                     )
 
     def _normalize_thresholds(self, thresholds):
-        """Normalize threshold values to structured format."""
+        """
+        Convert legacy or shorthand threshold formats into a consistent structured format.
+
+        Purpose:
+        - Ensures all threshold values are represented as dictionaries with explicit "type" and "value" fields.
+        - Converts simple numeric values to {"type": "value", "value": ...}
+        - Converts percentage strings (like "10%") to {"type": "percentage", "value": ...}
+        - Leaves already-structured or list values unchanged.
+
+        This normalization allows the rest of the code to process thresholds in a uniform way.
+        """
         normalized = {}
 
         for key, value in thresholds.items():
@@ -127,9 +135,9 @@ def _parse_threshold(self, threshold, base_value):
         """
         Parse threshold value which can be either:
         1. A dict with type and value fields
-        2. A list of dicts for multiple threshold types
-
-        Returns the most restrictive calculated threshold value.
+        2. A list of dicts for multiple threshold types,
+        possibly including a {"type": "comparison", "value": "min"/"max"}
+        Returns the selected calculated threshold value.
         """
         logger.debug("Parsing threshold: {} (type: {}) with base value: {}".format(
                      threshold, type(threshold).__name__, base_value))
@@ -152,7 +160,7 @@ def _parse_threshold(self, threshold, base_value):
                     if percentage < 0 or percentage > 100:
                         logger.warning("Percentage threshold outside normal range (0-100): {}%".format(percentage))
 
-                    calculated = (percentage / 100.0) * base_value
+                    calculated = round((percentage / 100.0) * base_value, 1)
                     logger.debug("Calculated percentage threshold: {}% of {} = {}".format(
                         percentage, base_value, calculated))
                     return calculated
@@ -161,7 +169,7 @@ def _parse_threshold(self, threshold, base_value):
                     return float('inf')
             elif threshold_type == 'value':
                 try:
-                    value = float(threshold_value)
+                    value = round(float(threshold_value), 1)
                     if value < 0:
                         logger.warning("Negative threshold value: {}".format(value))
                     logger.debug("Using absolute value: {}".format(value))
@@ -178,19 +186,27 @@ def _parse_threshold(self, threshold, base_value):
         elif isinstance(threshold, list):
             logger.debug("Processing a list of {} thresholds".format(len(threshold)))
             thresholds = []
-            for i, t in enumerate(threshold):
-                if isinstance(t, dict) and 'type' in t and 'value' in t:
+            comparison = None
+            for t in threshold:
+                if isinstance(t, dict) and t.get("type") == "comparison":
+                    # Accepts "min" or "max"
+                    comparison = t.get("value", None)
+                elif isinstance(t, dict) and 'type' in t and 'value' in t:
                     parsed = self._parse_threshold(t, base_value)
-                    logger.debug("List item {}: parsed value = {}".format(i, parsed))
+                    logger.debug("List item: parsed value = {}".format(parsed))
                     thresholds.append(parsed)
                 else:
                     logger.warning("Skipping invalid threshold list item: {}".format(t))
-
-            # Return the most restrictive (smallest) threshold
-            min_value = min(thresholds) if thresholds else float('inf')
-            logger.debug("Selected minimum threshold from list: {} (from values: {})".format(
-                         min_value, thresholds))
-            return min_value
+            if not thresholds:
+                return float('inf')
+            if comparison == "max":
+                selected = round(max(thresholds), 1)
+            else:
+                # Default to min if no comparison specified
+                selected = round(min(thresholds), 1)
+            logger.info("Selected {} threshold from list: {} (from values: {})".format(
+                         comparison if comparison else "min", selected, thresholds))
+            return selected
 
         # Handle deprecated formats with warning
         elif isinstance(threshold, (int, float, str)):
@@ -201,7 +217,7 @@ def _parse_threshold(self, threshold, base_value):
             if isinstance(threshold, str) and threshold.endswith('%'):
                 try:
                     percentage = float(threshold.rstrip('%'))
-                    calculated = (percentage / 100.0) * base_value
+                    calculated = round((percentage / 100.0) * base_value, 1)
                     logger.debug("Calculated legacy percentage threshold: {}% of {} = {}".format(
                         percentage, base_value, calculated))
                     return calculated
@@ -211,7 +227,7 @@ def _parse_threshold(self, threshold, base_value):
             else:
                 # Simple value
                 try:
-                    value = float(threshold)
+                    value = round(float(threshold), 1)
                     logger.debug("Using legacy absolute threshold: {}".format(value))
                     return value
                 except (ValueError, TypeError) as e:
@@ -227,24 +243,49 @@ def _handle_memory_threshold_exceeded(self, name, mem_item, value, threshold,
         logger.info("{}:{}, previous_values: {}".format(name, mem_item, previous_values))
         logger.info("{}:{}, current_values: {}".format(name, mem_item, current_values))
 
-        # Format threshold for display in a more readable format
+        # Enhanced formatting for value and threshold
+        def fmt(val, unit="MB"):
+            if isinstance(val, float) or isinstance(val, int):
+                return f"{val:.1f} {unit}"
+            return str(val)
+
+        # Determine threshold type and format accordingly
+        def format_threshold_and_value(threshold, value):
+            if isinstance(threshold, dict) and 'type' in threshold:
+                if threshold['type'] == 'percentage':
+                    return f"{value:.1f}%", f"{threshold['value']}"
+                elif threshold['type'] == 'value':
+                    return fmt(value), fmt(float(threshold['value']))
+            elif isinstance(threshold, list):
+                # Find the first threshold dict with type
+                for t in threshold:
+                    if isinstance(t, dict) and 'type' in t:
+                        return format_threshold_and_value(t, value)
+                return str(value), str(threshold)
+            else:
+                # fallback
+                return str(value), str(threshold)
+
         threshold_str = self._format_threshold_for_display(threshold)
         logger.debug("Threshold exceeded - measured value: {}, formatted threshold: {}".format(
             value, threshold_str))
 
+        prev_val = previous_values.get(name, {}).get(mem_item, 0)
+        curr_val = current_values.get(name, {}).get(mem_item, 0)
+
+        # Format for increase or high threshold
         if is_increase:
+            val_str, th_str = format_threshold_and_value(threshold, value)
             message = (
-                "[ALARM]: {}:{} memory usage increased by {}, "
-                "exceeds increase threshold {}".format(
-                    name, mem_item, value, threshold_str
-                )
+                "[ALARM]: {}:{} memory usage increased by {}, exceeds increase threshold {} (previous: {}, current: {})"
+                .format(name, mem_item, val_str, th_str, fmt(prev_val), fmt(curr_val))
             )
         else:
+            which = "Current" if is_current else "Previous"
+            val_str, th_str = format_threshold_and_value(threshold, value)
             message = (
-                "[ALARM]: {}:{}, {} memory usage {} exceeds "
-                "high threshold {}".format(
-                    name, mem_item, "Current" if is_current else "Previous", value, threshold_str
-                )
+                "[ALARM]: {}:{}, {} memory usage {} exceeds high threshold {} (previous: {}, current: {})"
+                .format(name, mem_item, which, val_str, th_str, fmt(prev_val), fmt(curr_val))
             )
 
         # Not return failure on Virtual Switch
@@ -385,9 +426,11 @@ def parse_top_output(output, memory_params):
             for mem_item, thresholds in memory_params.items():
                 if mem_item in process_info["COMMAND"]:
                     if mem_item in memory_values:
-                        memory_values[mem_item] += float(int(process_info["RES"]) / 1024)
+                        memory_values[mem_item] = round(
+                            memory_values[mem_item] + float(int(process_info["RES"]) / 1024), 1
+                        )
                     else:
-                        memory_values[mem_item] = float(int(process_info["RES"]) / 1024)
+                        memory_values[mem_item] = round(float(int(process_info["RES"]) / 1024), 1)
 
     logger.debug("Parsed memory values: {}".format(memory_values))
     return memory_values
@@ -414,7 +457,7 @@ def parse_free_output(output, memory_params):
     swap_info = {headers[i]: int(Swap[i]) for i in range(len(Swap))}
 
     for mem_item, _ in memory_params.items():
-        memory_values[mem_item] = mem_info.get(mem_item, 0) + swap_info.get(mem_item, 0)
+        memory_values[mem_item] = round(mem_info.get(mem_item, 0) + swap_info.get(mem_item, 0), 1)
 
     logger.debug("Parsed memory values: {}".format(memory_values))
     return memory_values
@@ -437,7 +480,7 @@ def parse_monit_status_output(output, memory_params):
             if match:
                 used_memory = match.group(1)         # noqa: F841
                 memory_percentage = match.group(2)
-                memory_values['memory_usage'] = float(memory_percentage)
+                memory_values['memory_usage'] = round(float(memory_percentage), 1)
             else:
                 logger.error("Failed to parse memory usage from line: {}".format(line))
         if "swap usage" in line:
@@ -475,7 +518,7 @@ def parse_docker_stats_output(output, memory_params):
                     match = re.search(pattern, line)
                     if match:
                         mem_usage = match.group(2)
-                        memory_values[mem_item] = mem_usage
+                        memory_values[mem_item] = round(float(mem_usage), 1)
                     else:
                         logger.error("Failed to parse memory usage from line: {}".format(line))
                 else:
@@ -511,10 +554,10 @@ def parse_frr_memory_output(output, memory_params):
                     if unit in unit_multipliers:
                         memory_bytes = value * unit_multipliers[unit]
                         # Convert to MB for consistent measurement
-                        memory_values['used'] = memory_bytes / (1024 * 1024)
+                        memory_values['used'] = round(memory_bytes / (1024 * 1024), 1)
                     else:
                         logger.warning("Unknown memory unit: {}, treating as bytes".format(unit))
-                        memory_values['used'] = value / (1024 * 1024)
+                        memory_values['used'] = round(value / (1024 * 1024), 1)
 
                 except (ValueError, TypeError) as e:
                     logger.error("Failed to parse FRR memory value: {}".format(e))

tests/common/plugins/memory_utilization/memory_utilization_dependence.json

@@ -17,7 +17,7 @@
         "zebra": {
           "memory_increase_threshold": {
             "type": "value",
-            "value": 64
+            "value": 128
           },
           "memory_high_threshold": null
         }
@@ -169,11 +169,12 @@
         "used": {
           "memory_increase_threshold": [
             {"type": "percentage", "value": "50%"},
-            {"type": "value", "value": 32}
+            {"type": "value", "value": 64},
+            {"type": "comparison", "value": "max"}
           ],
           "memory_high_threshold": {
             "type": "value",
-            "value": 128
+            "value": 256
           }
         }
       },
@@ -186,7 +187,8 @@
         "used": {
           "memory_increase_threshold": [
             {"type": "percentage", "value": "50%"},
-            {"type": "value", "value": 16}
+            {"type": "value", "value": 64},
+            {"type": "comparison", "value": "max"}
           ],
           "memory_high_threshold": {
             "type": "value",