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Added rateofchangesec operator to calculate change of value per second #1259

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merged 4 commits into from
Jun 27, 2022
Merged

Added rateofchangesec operator to calculate change of value per second #1259

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c4a6ee8
Added rateofchangesec operator to calculate change of value per second
Jun 21, 2022
37ac184
fix test returning metric name
Jun 21, 2022
91d8ff9
added release notes
Jun 27, 2022
980b691
Merge branch 'master' into rateofchangesec-operator
mergify[bot] Jun 27, 2022
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14 changes: 13 additions & 1 deletion gnocchi/rest/aggregates/operations.py
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Original file line number Diff line number Diff line change
Expand Up @@ -119,8 +119,20 @@ def _inner_rated_agg(values, axis):
}


def rateofchangesec(t, v):
"""Calculate change of value per second."""
values = numpy.divide(
numpy.diff(v.T, prepend=numpy.NaN),
numpy.divide(
numpy.diff(t, prepend=numpy.datetime64("NaT")),
numpy.timedelta64(1, 's'))
).T
return t, values


unary_operators_with_timestamps = {
u"rateofchange": lambda t, v: (t[1:], numpy.diff(v.T).T)
u"rateofchange": lambda t, v: (t[1:], numpy.diff(v.T).T),
u"rateofchangesec": rateofchangesec,
}


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29 changes: 29 additions & 0 deletions gnocchi/tests/test_aggregates.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1642,3 +1642,32 @@ def test_unary_operator(self):
numpy.timedelta64(1, 'h'), 4),
]}
}, values)

def test_rateofchangesec_operator(self):
self.incoming.add_measures(self.metric.id, [
incoming.Measure(datetime64(2014, 1, 1, 12, 0, 1), 0),
incoming.Measure(datetime64(2014, 1, 1, 12, 5, 10), 450),
incoming.Measure(datetime64(2014, 1, 1, 12, 10, 5), 900),
incoming.Measure(datetime64(2014, 1, 1, 12, 15, 30), 1350),
])
self.trigger_processing([self.metric])

values = processor.get_measures(
self.storage,
[processor.MetricReference(self.metric, "mean")],
["rateofchangesec", ["metric", str(self.metric.id), "mean"]],
granularities=[numpy.timedelta64(5, 'm')],
)

self.assertEqual({
str(self.metric.id): {
"mean": [(datetime64(2014, 1, 1, 12, 0, 0),
numpy.timedelta64(5, 'm'), eq_nan),
(datetime64(2014, 1, 1, 12, 5, 0),
numpy.timedelta64(5, 'm'), 1.5),
(datetime64(2014, 1, 1, 12, 10, 0),
numpy.timedelta64(5, 'm'), 1.5),
(datetime64(2014, 1, 1, 12, 15, 0),
numpy.timedelta64(5, 'm'), 1.5),
]}
}, values)