feat(inputs.example): Add secret-store sample code (#12550)

plugins/inputs/example/example.go

@@ -29,6 +29,10 @@ type Example struct {
 	// Example of passing a duration option allowing the format of e.g. "100ms", "5m" or "1h"
 	Timeout config.Duration `toml:"timeout"`
 
+	// Example of passing a password/token/username or other sensitive data with the secret-store
+	UserName config.Secret `toml:"username"`
+	Password config.Secret `toml:"password"`
+
 	// Telegraf logging facility
 	// The exact name is important to allow automatic initialization by telegraf.
 	Log telegraf.Logger `toml:"-"`
@@ -56,6 +60,19 @@ func (m *Example) Init() error {
 		m.NumberFields = 2
 	}
 
+	// Check using the secret-store
+	if m.UserName.Empty() {
+		// For example, use a default value
+		m.Log.Debug("using default username")
+	}
+
+	// Retrieve credentials using the secret-store
+	password, err := m.Password.Get()
+	if err != nil {
+		return fmt.Errorf("getting password failed: %w", err)
+	}
+	defer config.ReleaseSecret(password)
+
 	// Initialze your internal states
 	m.count = 1