Fix request for time series data exceeding limit

[SeanHai]

There are some trend grafhs which need get data from a 'start' to a 'end' with a 'interval' from prometheus, but there is a limit in promrtheus is only 11000 points permit for one query
(https://github.com/prometheus/prometheus/blob/6f3e664ae712850b020d95c5c8b8a6ff841803bd/web/api/v1/api.go#L434-L438).
So you need check the ponits queried and request splitting if the limit is exceeded. If not this error will occur ‘exceeded maximum resolution of 11,000 points per timeseries’

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