Get all possible filters from backend

frontend/src/components/LogViewer.vue

@@ -44,6 +44,7 @@ export default {
         enableCellChangeFlash: true
       },
       currentRowCount: 0,
+      comboBoxOptions: {},
       viewRowCount: 20,
       comboBoxOptions: [],
       columnDefs:  [
@@ -88,6 +89,7 @@ export default {
     setupStream() {
       let es = new EventSource('/events');
       es.onmessage = (e) => this.handleReceiveMessage(e)
+      es.addEventListener("filters", (e) => this.handleReceiveFilters(e))
     },
     onGridReady(params) {
       this.gridApi = params.api;
@@ -102,6 +104,9 @@ export default {
       this.gridApi.flashCells({ rowNodes: [rowNode]});
       this.gridApi.sizeColumnsToFit()
     },
+    handleReceiveFilters (event) {
+      this.comboBoxOptions = this.parseEventData(event.data);
+    },
     parseEventData (eventData) {
       try {
         let json = JSON.parse(eventData)