is unsubscribe needed in my case?

[bagaskarala]

i use rxjs on vue project. there are API service which made of observable, then it can be used on component.

here is my code to fetch report from API, then i invoke it fetchReport() on mounted or on click button. the usecase is user can click more than once in the button.

  fetchReport() {
    this.$apiService
      .fetchReport()
      .subscribe((res) => {
        if (res.data.error) {
          alert('failed')
        } else {
          this.reports = res.data.data
        }
      });
  }

should i implement unsubscribe in this case? what if i dont implement it, does this affect on memory leaks?
i still dont get it, what i think for now is, when that method is finish executed, the subscription will be ended, is it true or not? need further explanation