This repository contains code and datasets used in the experiments described in our paper [1].

• [1]: Yuuki Tsubouchi, Hirofumi Tsuruta, "MetricSifter: Feature Reduction of Multivariate Time Series Data for Efficient Fault Localization in Cloud Applications", IEEE Access (ACCESS) , Vol. 12, pp. 37398-37417, March 2024.

MetricSifter is a feature reduction framework designed to accurately identify anomalous metrics caused by faults for enhancing fault localization. Our key insight is that the change point times inside the failure duration are close to each other for the failure-related metrics. MetricSifter detects change points per metric, localizes the time frame with the highest change point density, and excludes metrics with no change points in that time frame. The offline change point detection is implemented by ruptures, and the segmentation of the detected change points is based on kernel density estimation (KDE).

You can install metricsifter package from PyPI via pip install metricsifter.

from metricsifter.sifter import Sifter
from tests.sample_gen.generator import generate_synthetic_data

## Create time series data
normal_data, abonormal_data, _, _, anomalous_nodes = generate_synthetic_data(num_node=20, num_edge=20, num_normal_samples=55, num_abnormal_samples=15, anomaly_type=0)
data = pd.concat([normal_data, abonormal_data], axis=0, ignore_index=True)

## Remove the variables of time series data
sifter = Sifter(penalty_adjust=2.0, n_jobs=1)
sifted_data = sifter.run(data=data)
print("(#removed metrics) / (#total metrics):", len(set(data.columns) - set(siftered_data.columns)), "/", len(data.columns))
print("difference between prediction and ground truth:", set(siftered_data.columns) - anomalous_nodes)
assert set(sifted_data.columns) - anomalous_nodes == set()

The example of original synthetic data and its sifted data is shown in the following figure.

Run test cases with the following commands.

# Install dependencies for development
python -m pip install -r requirements-dev.txt
# Run test cases
pytest -s -v tests

BSD-3-Clause