constantLine() function doesn't work about grafana HOT 5 CLOSED

This is due to a bug in graphite when using constantLine and json format (graphite-project/graphite-web#375), might be fixed next graphite release. I will try to find a substitute solution.

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I don't get an HTTP Error, but Grafana does not display the Line even though there is a entry in the legend. The JSON response from Graphite is [{"target": "100", "datapoints": [[100, 1391608623]]}]

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seems to just return a single point.I think for constantLine we can use flot grid markings instead.

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a. There is a bug in current version of graphite regarding using the function constantLine/threshold in confluence with format of json

I needed the function ( y (t) = constant)(constant line and threshold in graphite) for displaying error and warning lines.

The following changes are to be made to the graphite in the graphite web as we need to type cast the timestamps in render/views.py to integers.
if format == 'json': timestamps = range(int(series.start), int(series.end), int(series.step))
b. I also had to change the constantLine function in functions.py in same folder (render
def constantLine(requestContext, value): #To make data consistent with the storage schema of the graphite so that we can use same json data for graphing start = int(timestamp( requestContext["startTime"] )/10)*10 end = int(timestamp( requestContext["endTime"])/10)*10 #step = (end -start -1)/1.0 step = 10 # similar to graphite val_tmp = [value] * int((end-start)/10) series = TimeSeries(str(value), start, end, step,val_tmp) return [series]
Once you do this: we could safely use the constantLine function for displaying errors and warnings.

Hope this helps.

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👍 awesome feature ! :)

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