How to clean up and remove expvar variables when they are no longer needed in Go?

In Go, expvar variables can be removed by calling the expvar.Remove() function. This function takes a parameter of the variable name that needs to be removed.

Here is an example of how to clean up and remove expvar variables:

package main

import (
	"expvar"
	"fmt"
	"time"
)

func main() {
	// Create a new expvar variable
	myVar := expvar.NewInt("myVar")
	myVar.Set(123)

	// Print the variable value
	fmt.Println("myVar:", myVar.Value())

	// Wait for some time to simulate the usage of the variable
	time.Sleep(time.Second * 5)

	// Remove the variable when it is no longer needed
	expvar.Remove("myVar")

	// Print the variable again after removal, which will print an empty string
	fmt.Println("myVar after removal:", myVar.Value())
}

In this example, we create an expvar variable named "myVar" using expvar.NewInt(). After setting its value, we print the value using myVar.Value(). Then, we simulate the usage of the variable by waiting for some time. Finally, we remove the variable using expvar.Remove(). After removal, if we try to print the variable again, it will print an empty string.