Fix explore mode in Grafana 6.x, closes #888

Migrate target.mode to target.queryType because Explore uses target.mode and overwrites it.

src/datasource-zabbix/constants.ts

@@ -0,0 +1,41 @@
+// Data point
+export const DATAPOINT_VALUE = 0;
+export const DATAPOINT_TS = 1;
+
+// Editor modes
+export const MODE_METRICS = 0;
+export const MODE_ITSERVICE = 1;
+export const MODE_TEXT = 2;
+export const MODE_ITEMID = 3;
+export const MODE_TRIGGERS = 4;
+
+// Triggers severity
+export const SEV_NOT_CLASSIFIED = 0;
+export const SEV_INFORMATION = 1;
+export const SEV_WARNING = 2;
+export const SEV_AVERAGE = 3;
+export const SEV_HIGH = 4;
+export const SEV_DISASTER = 5;
+
+export const SHOW_ALL_TRIGGERS = [0, 1];
+export const SHOW_ALL_EVENTS = [0, 1];
+export const SHOW_OK_EVENTS = 1;
+
+// Acknowledge
+export const ZBX_ACK_ACTION_NONE = 0;
+export const ZBX_ACK_ACTION_ACK = 2;
+export const ZBX_ACK_ACTION_ADD_MESSAGE = 4;
+
+export const TRIGGER_SEVERITY = [
+  {val: 0, text: 'Not classified'},
+  {val: 1, text: 'Information'},
+  {val: 2, text: 'Warning'},
+  {val: 3, text: 'Average'},
+  {val: 4, text: 'High'},
+  {val: 5, text: 'Disaster'}
+];
+
+/** Minimum interval for SLA over time (1 hour) */
+export const MIN_SLA_INTERVAL = 3600;
+
+export const RANGE_VARIABLE_VALUE = 'range_series';