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splunk-enterprise
Guidance on deploying Splunk Enterprise on Azure with automated reference implementation
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
It seems that Splunk is not related to Azure DevOps. Found an article about Splunk Enterprise and a video about Use Splunk to Collect Logs from Office 365 and Azure AD.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.