```json
{
  "TragedyDegree": 4,
  "ComedyDegree": 3
}
```

Explanation:

**Tragedy Degree:** The story has some tragic elements, such as Lord Alistair's impending end and the bittersweet memories of his past, but it lacks a profoundly tragic occurrence or strong emotional impact that would push it towards a higher tragedy degree. The main tragic aspect is the natural end of an era rather than a deep, emotionally scarring event. Thus, it sits at a 4 for moderate tragic plots with some emotional setbacks.

**Comedy Degree:** There are hardly any comedic elements in this story. It is relatively serious and focuses more on the themes of duty, legacy, and transition rather than light-hearted or humorous elements. The closest it comes to a positive note is the hopeful future of the kingdom in the hands of Lady Elara, but this alone does not merit a high comedy degree. Hence, it scores a 3 for having a slightly optimistic ending but very few comedic aspects.
