Merge branch 'v4.3.x'

public/app/plugins/panel/graph/graph.ts

@@ -555,12 +555,19 @@ coreModule.directive('grafanaGraph', function($rootScope, timeSrv, popoverSrv) {
           return;
         }
 
+        if (Number.isFinite(min) && Number.isFinite(max)) {
           axis.ticks = [];
           var nextTick;
           for (nextTick = min; nextTick <= max; nextTick *= axis.logBase) {
             axis.ticks.push(nextTick);
           }
           axis.tickDecimals = decimalPlaces(min);
+        } else {
+          axis.ticks = [1, 2];
+          delete axis.min;
+          delete axis.max;
+        }
+
       }
 
       function decimalPlaces(num) {

public/app/plugins/panel/graph/specs/graph_specs.ts

@@ -153,6 +153,29 @@ describe('grafanaGraph', function() {
     });
   });
 
+  graphScenario('when logBase is log 10 and data points contain only zeroes', function(ctx) {
+    ctx.setup(function(ctrl, data) {
+      ctrl.panel.yaxes[0].logBase = 10;
+      data[0] = new TimeSeries({
+        datapoints: [[0,1],[0,2],[0,3],[0,4]],
+        alias: 'seriesAutoscale',
+      });
+      data[0].yaxis = 1;
+    });
+
+    it('should not set min and max and should create some fake ticks', function() {
+      var axisAutoscale = ctx.plotOptions.yaxes[0];
+      expect(axisAutoscale.transform(100)).to.be(2);
+      expect(axisAutoscale.inverseTransform(-3)).to.be(0.001);
+      expect(axisAutoscale.min).to.be(undefined);
+      expect(axisAutoscale.max).to.be(undefined);
+      expect(axisAutoscale.ticks.length).to.be(2);
+      expect(axisAutoscale.ticks[0]).to.be(1);
+      expect(axisAutoscale.ticks[1]).to.be(2);
+      expect(axisAutoscale.tickDecimals).to.be(undefined);
+    });
+  });
+
   graphScenario('dashed lines options', function(ctx) {
     ctx.setup(function(ctrl) {
       ctrl.panel.lines = true;