Hot threads should include timestamp and params #9773
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When looking at a hot threads output, it's useful to know the exact time when the hot threads were taken, e.g. to correlate back to Marvel charts or other monitors. If multiple hot threads were pulled at different times it's useful to know which one was when.
I think it's also useful to know the params that were passed (interval, busiestThreads count, whether idle threads were ignored).
This change just adds a line at the top of each node's hot threads, like this:
Hot threads at 2015-02-19T10:33:52.333Z, interval=500ms, busiestThreads=2147483647, ignoreIdleThreads=false: