lt

Less than operator. There are two variants of the :lt operator.

Choosing

Input Stack: v: String k: String

⇨

Output Stack: (k < v): Query

This first variant is used for choosing the set of time series to operate on. It selects time series that have a value for a key that is less than a specified value. For example, consider the following query:

name,ssCpuSystem,:lt

When matching against the sample data in the table below, the highlighted time series would be included in the result set:

Name	nf.app	nf.node
ssCpuUser	alerttest	i-0123
ssCpuSystem	alerttest	i-0123
ssCpuUser	nccp	i-0abc
ssCpuSystem	nccp	i-0abc
numRequests	nccp	i-0abc
ssCpuUser	api	i-0456

Math

Input Stack: ts2: TimeSeriesExpr ts1: TimeSeriesExpr

⇨

Output Stack: (ts1 < ts2): TimeSeriesExpr

Compute a new time series where each interval has the value (a < b) where a and b are the corresponding intervals in the input time series. For example:

Time	a	b	a < b
00:01	0.0	0.0	0.0
00:01	0.0	1.0	1.0
00:02	1.0	0.0	0.0
00:03	1.0	1.0	0.0
00:04	0.5	1.7	1.0

The result will be a signal time series that will be 1.0 for intervals where the condition is true and 0.0 for intervals where it is false.

Example:

Before	After
minuteOfHour,:time, hourOfDay,:time	minuteOfHour,:time, hourOfDay,:time, :lt