schema: add threshold stats counters

Add schema definitions for new threshold-related statistics:
- bitmap_alloc_fail: Count of bitmap allocation failures
- bitmap_memuse: Memory usage by detection_filter bitmaps
- memcap: Memory cap for threshold hash table
- memuse: Memory usage by threshold hash table

Task #7928

etc/schema.json

@@ -7349,6 +7349,28 @@
                         "mpm_list": {
                             "type": "integer",
                             "description": "If profiling is enabled, average count of signatures in the mpm prefilter list"
+                        },
+                        "thresholds": {
+                            "type": "object",
+                            "additionalProperties": false,
+                            "properties": {
+                                "bitmap_alloc_fail": {
+                                    "type": "integer",
+                                    "description": "Count of bitmap allocation failures"
+                                },
+                                "bitmap_memuse": {
+                                    "type": "integer",
+                                    "description": "Memory usage by detection_filter bitmaps"
+                                },
+                                "memcap": {
+                                    "type": "integer",
+                                    "description": "Memory cap for threshold hash table"
+                                },
+                                "memuse": {
+                                    "type": "integer",
+                                    "description": "Memory usage by threshold hash table"
+                                }
+                            }
                         }
                     }
                 },