Add YANG models for configurable drop monitor feature

src/sonic-yang-models/doc/Configuration.md

@@ -26,6 +26,7 @@
   * [CRM](#crm)
   * [CRM DASH](#crm-dash)
   * [DEBUG_COUNTER and DEBUG_COUNTER_DROP_REASON](#debug_counter-and-debug_counter_drop_reason)
+  * [DEBUG_DROP_MONITOR](#debug_drop_monitor)
   * [DEFAULT_LOSSLESS_BUFFER_PARAMETER](#DEFAULT_LOSSLESS_BUFFER_PARAMETER)
   * [Device Metadata](#device-metadata)
   * [Device neighbor metada](#device-neighbor-metada)
@@ -987,19 +988,27 @@ DEBUG_COUNTER:
 ```
 ; DEBUG_COUNTER table
 
-key             = DEBUG_COUNTER_TABLE:name
-name            = string
-type            = (SWITCH_INGRESS_DROPS|PORT_INGRESS_DROPS|SWITCH_EGRESS_DROPS|PORT_EGRESS_DROPS)
-alias           = string (optional)
-description     = string (optional)
-group           = string (optional)
+key                      = DEBUG_COUNTER_TABLE:name
+name                     = string
+type                     = (SWITCH_INGRESS_DROPS|PORT_INGRESS_DROPS|SWITCH_EGRESS_DROPS|PORT_EGRESS_DROPS)
+alias                    = string (optional)
+description              = string (optional)
+group                    = string (optional)
+drop_monitor_status      = admin_mode (enabled/disabled, default disabled)
+drop_count_threshold     = uint64 (optional)
+incident_count_threshold = uint64 (optional)
+window                   = uint64 (optional)
 
 "DEBUG_COUNTER": {
     "DEBUG_4": {
         "alias": "BAD_DROPS",
         "desc": "More port ingress drops",
         "group": "BAD",
-        "type": "SWITCH_INGRESS_DROPS"
+        "type": "SWITCH_INGRESS_DROPS",
+        "drop_monitor_status": "disabled",
+        "drop_count_threshold": "10",
+        "incident_count_threshold": "2",
+        "window": "300"
     }
 }
 ```
@@ -1016,6 +1025,21 @@ reason  = a valid drop reason without the 'SAI_IN/OUT_DROP_REASON_' prefix (http
 }
 ```
 
+### DEBUG_DROP_MONITOR
+Ingress and eggress port debug counter flows can be monitored for persistent drops using
+debug drop monitor feature. This table shows the status and configurations of the feature which can
+be modified via the CLI.
+
+```
+{
+    "DEBUG_DROP_MONITOR": {
+        "CONFIG": {
+            "status": "disabled",
+        }
+    }
+}
+```
+
 ### DEFAULT_LOSSLESS_BUFFER_PARAMETER
 
 This table stores the default lossless buffer parameters for dynamic buffer calculation.

src/sonic-yang-models/tests/files/sample_config_db.json

@@ -2225,6 +2225,12 @@
             }
         },
 
+        "DEBUG_DROP_MONITOR": {
+            "CONFIG": {
+                "status": "disabled"
+            }
+        },
+
         "QUEUE": {
             "Ethernet0|0": {
                 "scheduler": "TEST@0",
@@ -2936,7 +2942,11 @@
                 "alias": "BAD_DROPS",
                 "desc": "More port ingress drops",
                 "group": "BAD",
-                "type": "SWITCH_INGRESS_DROPS"
+                "type": "SWITCH_INGRESS_DROPS",
+                "drop_monitor_status": "disabled",
+                "drop_count_threshold": "10",
+                "incident_count_threshold": "2",
+                "window": "300"
             }
         },
         "DEBUG_COUNTER_DROP_REASON": {

src/sonic-yang-models/tests/yang_model_tests/tests/debug_counter.json

@@ -20,5 +20,13 @@
     "INVALID_DROP_REASON": {
         "desc": "Add an invalid drop reason to a counter",
         "eStrKey": "InvalidValue"
+    },
+
+    "VALID_DEBUG_DROP_MONITOR_STATUS": {
+        "desc": "Configure status to be enabled/disabled."
+    },
+    "INVALID_DEBUG_DROP_MONITOR_STATUS": {
+        "desc": "Configure invalid value for status.",
+        "eStrKey": "InvalidValue"
     }
 }

src/sonic-yang-models/tests/yang_model_tests/tests_config/debug_counter.json

@@ -161,5 +161,23 @@
                 ]
             }
         }
+    },
+    "VALID_DEBUG_DROP_MONITOR_STATUS": {
+        "sonic-debug-counter:sonic-debug-counter": {
+            "sonic-debug-counter:DEBUG_DROP_MONITOR": {
+                "CONFIG": {
+                    "status": "enabled"
+                }
+            }
+        }
+    },
+    "INVALID_DEBUG_DROP_MONITOR_STATUS": {
+        "sonic-debug-counter:sonic-debug-counter": {
+            "sonic-debug-counter:DEBUG_DROP_MONITOR": {
+                "CONFIG": {
+                    "status": "invalid"
+                }
+            }
+        }
     }
 }

src/sonic-yang-models/yang-models/sonic-debug-counter.yang

@@ -45,6 +45,31 @@ module sonic-debug-counter {
                     description "Group name to organize counters";
                 }
 
+                leaf drop_monitor_status {
+                    type stypes:admin_mode;
+                    default "disabled";
+                    description "Indicates whether the feature is enabled or disabled.";
+                }
+
+                leaf window {
+                    type uint64;
+                    default 900;
+                    units seconds;
+                    description "The length of the time window in seconds";
+                }
+
+                leaf incident_count_threshold {
+                    type uint64;
+                    default 3;
+                    description "The number of incidents that have to occur per window for it to be registered as a syslog";
+                }
+
+                leaf drop_count_threshold {
+                    type uint64;
+                    default 100;
+                    description "The number of packet drops required for being classified as an incident";
+                }
+
                 leaf type {
                     type stypes:debug_counter_type;
                     mandatory true;
@@ -71,5 +96,17 @@ module sonic-debug-counter {
                 }
             }
         }
+
+        container DEBUG_DROP_MONITOR {
+            container CONFIG {
+                description "Stores configuration for debug drop monitor in CONFIG_DB";
+
+                leaf status {
+                    type stypes:admin_mode;
+                    default "disabled";
+                    description "Indicates whether the feature is enabled or disabled.";
+                }
+            }
+        }
     }
 }