How to check if which hook triggered the call to a function?

I found the magic code you need.

Use current_filter(). This function will return name of the current filter or action.

add_action('my_test_hook_1','my_test_callback_function');
add_action('my_test_hook_2','my_test_callback_function');
add_action('my_test_hook_3','my_test_callback_function');
add_action('my_test_hook_4','my_test_callback_function');

function my_test_callback_function(){

    $called_action_hook = current_filter(); // ***The magic code that will return the last called action

    echo "This function is called by action: " . $called_action_hook ;

}

For reference: https://developer.wordpress.org/reference/functions/current_filter/