message: fix(pulse): Manual Chart Refresh fix
diff: import { Injectable } from '@angular/core';
  -import { HttpClient } from '@angular/common/http';
  +import { HttpClient, HttpParams } from '@angular/common/http';
  import { Observable } from 'rxjs/Observable';
  import { ConfigService } from '../shared/services/config.service';
  import { CpuStats, DiskStats, NetworkStats, RamStats } from './stats';
  @@ -72,13 +72,13 @@ export class PulseService {
  ) {
  const t = `${timeParams.range}/${timeParams.aggregation}/${timeParams.shift}`;
  - let search;
  + let requestParams = new HttpParams();
  if (forceUpdate) {
  - search = { _: `${new Date().getTime()}` };
  + requestParams = requestParams.set('_', `${new Date().getTime()}`);
  }
  return this.http
  - .get(`cs-extensions/pulse/${endpoint}/${params}/${t}`, { params: search })
  + .get(`cs-extensions/pulse/${endpoint}/${params}/${t}`, { params: requestParams })
  .map(res => res['result']);
  }
  }
  