private void receiveIssueCreatedActivities() {
    /* Формируем GET HTTP-запрос по ресурсу
        /activites?category=IssueCreatedCategory
    */
    Mono<JsonNode[]> request = client.get()
        .uri(uriBuilder -> uriBuilder
            .path("/activites/")
            .queryParam("category", "IssueCreatedCategory")
            .build())
        .header(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
        .retrieve()
        .bodyToMono(JsonNode[].class);
    JsonNode[] responseData = request.block();
    for (JsonNode item:responseData) {
        receivedEventData.put(item);
    }
}