Use monit validate to get live data (sonic-net#19759)

What is the motivation for this PR?
disk/test_disk_exhaustion.py creates a 1.7G file in the test and deletes it at the end of the test.
But "monit status" is configured to check only once every 60 secs in /etc/monit/monitrc.
This provides a stale data resulting in memory high threshold getting breached.

How did you do it?
We should use "monit validate" instead of "monit status"

How did you verify/test it?
verified by running the test

Signed-off-by: Guy Shemesh <gshemesh@nvidia.com>

Author: dhanasekar-arista

tests/common/plugins/memory_utilization/README.md

@@ -12,7 +12,7 @@
   - [Enabling and Disabling](#enabling-and-disabling)
   - [Configuration Examples](#configuration-examples)
 - [Supported Memory Monitors](#supported-memory-monitors)
-  - [Monit Status Monitor](#monit-status-monitor)
+  - [Monit Validate Monitor](#monit-validate-monitor)
   - [Free Memory Monitor](#free-memory-monitor)
   - [Docker Stats Monitor](#docker-stats-monitor)
   - [Top Monitor](#top-monitor)
@@ -225,12 +225,12 @@ Memory utilization checking is enabled by default for all tests. To disable it:
 
 ## Supported Memory Monitors and Configuration Examples
 
-### Monit Status Monitor
+### Monit Validate Monitor
 
 Monitors system memory usage via Monit.
 
-- **Command**: `sudo monit status`
-- **Parser Function**: `parse_monit_status_output`
+- **Command**: `sudo monit validate`
+- **Parser Function**: `parse_monit_validate_output`
 - **Monitored Parameters**:
   - `memory_usage`: System memory utilization percentage
 - **Threshold Type**: Use `percentage_points` for percentage-based thresholds
@@ -239,7 +239,7 @@ Example configuration:
 ```json
 {
   "name": "monit",
-  "cmd": "sudo monit status",
+  "cmd": "sudo monit validate",
   "memory_params": {
     "memory_usage": {
       "memory_increase_threshold": {
@@ -252,7 +252,7 @@ Example configuration:
       }
     }
   },
-  "memory_check": "parse_monit_status_output"
+  "memory_check": "parse_monit_validate_output"
 }
 ```
 
@@ -414,7 +414,7 @@ Example:
   "Arista-7050QX": [
     {
       "name": "monit",
-      "cmd": "sudo monit status",
+      "cmd": "sudo monit validate",
       "memory_params": {
         "memory_usage": {
           "memory_increase_threshold": {
@@ -427,7 +427,7 @@ Example:
           }
         }
       },
-      "memory_check": "parse_monit_status_output"
+      "memory_check": "parse_monit_validate_output"
     }
   ]
 }

tests/common/plugins/memory_utilization/memory_utilization.py

@@ -495,12 +495,12 @@ def parse_free_output(output, memory_params):
     return memory_values
 
 
-def parse_monit_status_output(output, memory_params):
-    """Parse the 'monit status' command output to extract memory usage information."""
+def parse_monit_validate_output(output, memory_params):
+    """Parse the 'monit validate' command output to extract memory usage information."""
     memory_values = {}
 
     if not output:
-        logger.warning("Empty output for monit status command, returning empty values")
+        logger.warning("Empty output for monit validate command, returning empty values")
         return memory_values
 
     memory_pattern = r"memory usage\s+([\d\.]+ \w+)\s+\[(\d+\.\d+)%\]"

tests/common/plugins/memory_utilization/memory_utilization_common.json

@@ -2,7 +2,7 @@
   "COMMON": [
     {
       "name": "monit",
-      "cmd": "sudo monit status",
+      "cmd": "sudo monit validate",
       "memory_params": {
         "memory_usage": {
           "memory_increase_threshold": {
@@ -15,7 +15,7 @@
           }
         }
       },
-      "memory_check": "parse_monit_status_output"
+      "memory_check": "parse_monit_validate_output"
     }
   ]
 }

tests/common/plugins/memory_utilization/memory_utilization_dependence.json

@@ -41,7 +41,7 @@
     },
     {
       "name": "monit",
-      "cmd": "sudo monit status",
+      "cmd": "sudo monit validate",
       "memory_params": {
         "memory_usage": {
           "memory_increase_threshold": {
@@ -54,7 +54,7 @@
           }
         }
       },
-      "memory_check": "parse_monit_status_output"
+      "memory_check": "parse_monit_validate_output"
     },
     {
       "name": "docker",
@@ -203,7 +203,7 @@
   "Arista-7050QX": [
     {
       "name": "monit",
-      "cmd": "sudo monit status",
+      "cmd": "sudo monit validate",
       "memory_params": {
         "memory_usage": {
           "memory_increase_threshold": {
@@ -216,13 +216,13 @@
           }
         }
       },
-      "memory_check": "parse_monit_status_output"
+      "memory_check": "parse_monit_validate_output"
     }
   ],
   "Mellanox-SN4600C": [
     {
       "name": "monit",
-      "cmd": "sudo monit status",
+      "cmd": "sudo monit validate",
       "memory_params": {
         "memory_usage": {
           "memory_increase_threshold": {
@@ -235,7 +235,7 @@
           }
         }
       },
-      "memory_check": "parse_monit_status_output"
+      "memory_check": "parse_monit_validate_output"
     },
     {
       "name": "docker",