DB error attribution gating fixes

src/go/plugin/go.d/collector/mssql/collector.go

@@ -7,6 +7,7 @@ import (
 	"database/sql"
 	_ "embed"
 	"errors"
+	"strings"
 	"sync"
 	"time"
 
@@ -72,6 +73,26 @@ type Config struct {
 	// Default: true - MSSQL Query Store may contain unmasked PII in query text
 	QueryStoreFunctionEnabled *bool `yaml:"query_store_function_enabled,omitempty" json:"query_store_function_enabled"`
 
+	// DeadlockInfoFunctionEnabled controls whether the deadlock-info function is available
+	// Uses pointer to distinguish "unset" from explicit "false":
+	//   - nil (unset): Apply default of true (enabled)
+	//   - false: Explicitly disabled
+	//   - true: Explicitly enabled
+	// Default: true
+	DeadlockInfoFunctionEnabled *bool `yaml:"deadlock_info_function_enabled,omitempty" json:"deadlock_info_function_enabled"`
+
+	// ErrorInfoFunctionEnabled controls whether the error-info function is available
+	// Uses pointer to distinguish "unset" from explicit "false":
+	//   - nil (unset): Apply default of true (enabled)
+	//   - false: Explicitly disabled
+	//   - true: Explicitly enabled
+	// Default: true
+	ErrorInfoFunctionEnabled *bool `yaml:"error_info_function_enabled,omitempty" json:"error_info_function_enabled"`
+
+	// ErrorInfoSessionName sets the Extended Events session name for error-info
+	// Default: "netdata_errors"
+	ErrorInfoSessionName string `yaml:"error_info_session_name,omitempty" json:"error_info_session_name,omitempty"`
+
 	// TopQueriesLimit is the maximum number of queries to return
 	TopQueriesLimit int `yaml:"top_queries_limit,omitempty" json:"top_queries_limit,omitempty"`
 }
@@ -92,6 +113,30 @@ func (c *Config) GetQueryStoreFunctionEnabled() bool {
 	return *c.QueryStoreFunctionEnabled
 }
 
+// GetDeadlockInfoFunctionEnabled returns whether the deadlock-info function is enabled (default: true)
+func (c *Config) GetDeadlockInfoFunctionEnabled() bool {
+	if c.DeadlockInfoFunctionEnabled == nil {
+		return true
+	}
+	return *c.DeadlockInfoFunctionEnabled
+}
+
+// GetErrorInfoFunctionEnabled returns whether the error-info function is enabled (default: true)
+func (c *Config) GetErrorInfoFunctionEnabled() bool {
+	if c.ErrorInfoFunctionEnabled == nil {
+		return true
+	}
+	return *c.ErrorInfoFunctionEnabled
+}
+
+// GetErrorInfoSessionName returns the Extended Events session name for error-info.
+func (c *Config) GetErrorInfoSessionName() string {
+	if strings.TrimSpace(c.ErrorInfoSessionName) == "" {
+		return "netdata_errors"
+	}
+	return c.ErrorInfoSessionName
+}
+
 type Collector struct {
 	module.Base
 	Config `yaml:",inline" json:""`

src/go/plugin/go.d/collector/mssql/config_schema.json

@@ -50,6 +50,24 @@
         "minimum": 1,
         "maximum": 5000,
         "default": 500
+      },
+      "deadlock_info_function_enabled": {
+        "title": "Enable Deadlock Info Function",
+        "description": "Enable the deadlock-info function. WARNING: query text may contain unmasked sensitive literals (PII). This function reads deadlock graphs from the system_health session and requires VIEW SERVER STATE. Grant with: GRANT VIEW SERVER STATE TO [netdata_user];",
+        "type": "boolean",
+        "default": true
+      },
+      "error_info_function_enabled": {
+        "title": "Enable Error Info Function",
+        "description": "Enable the error-info function. WARNING: error messages and query text may contain unmasked sensitive literals (PII). This function reads from a user-managed Extended Events session and requires VIEW SERVER STATE.",
+        "type": "boolean",
+        "default": true
+      },
+      "error_info_session_name": {
+        "title": "Error Info Session Name",
+        "description": "Name of the Extended Events session that captures error_reported events for error-info. The session must be created by an administrator and include a ring_buffer target.",
+        "type": "string",
+        "default": "netdata_errors"
       }
     },
     "required": [
@@ -79,6 +97,15 @@
     "query_store_time_window_days": {
       "ui:help": "Limits Query Store data to recent days. Lower values improve performance on busy servers."
     },
+    "deadlock_info_function_enabled": {
+      "ui:help": "When enabled, the deadlock-info function becomes available in the Netdata dashboard. WARNING: query text may contain unmasked sensitive literals and requires VIEW SERVER STATE permission."
+    },
+    "error_info_function_enabled": {
+      "ui:help": "When enabled, the error-info function becomes available in the Netdata dashboard. WARNING: error messages and query text may include sensitive literals."
+    },
+    "error_info_session_name": {
+      "ui:help": "The Extended Events session must be created by an administrator and include a ring_buffer target capturing sqlserver.error_reported with sql_text action."
+    },
     "ui:flavour": "tabs",
     "ui:options": {
       "tabs": [
@@ -88,7 +115,8 @@
             "update_every",
             "dsn",
             "timeout",
-            "vnode"
+            "vnode",
+            "deadlock_info_function_enabled"
           ]
         },
         {