private searchClickSubject:Subject<void>;  // Submit form
private searchClick$:Observable<any>;
private metrics$:Observable<MetricGroup>;

constructor() {
    // Prepare observers
    this.searchClickSubject = new Subject<void>();
    this.searchClick$ = this.searchClickSubject.asObservable();
}

public ngOnInit() {
    // Grab search button click event
    this.searchQuery$ = this.searchClick$.pipe(
        map(() => <Query>{
            offset: 0,
            limit: AmetriquesComponent.DEFAULT_PAGE_SIZE
        })
    );

    const loading = () => tap(() => this.loadingPage());
    const getAggregatedMetrics = () => switchMap((query: Query) => this.service.getAggregatedMetrics(query));
    const loaded = () => tap((aggregatedMetrics: MetricGroup) => this.loadedMetric(aggregatedMetrics));

    this.metrics$ = this.searchQuery$
        .pipe(
            loading(),
            getAggregatedMetrics(),
            loaded(),
            share()
        );
}