feat(standalone): Create new metrics module that processes flows and update HNS plugin to emit relevant metrics #1859
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BeegiiK
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We should split standard and standalone metrics module. Each mode should have its own enrichment/metric computation logic.
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Description
This PR is part 2/2 of a POC on enabling Retina to work outside of Kubernetes (ACI) and collect pod level information such as name and namespace by running it as a binary on the host VM.
This PR focuses on reading the flows for each corresponding metric via the metric module and updating the HNS plugin so that these metrics are updated accordingly
The DNS, drops, forward, TCP flags metrics were updated and the HNS and TCP connections metrics were added (advanced). In these metrics, were reading the flows extensions field which contains the HNS metadata. The protobuf messages were updated (needed to update linux
.protofile aswell since the messages couldn't be recognized inflow_utils.go. This followsRetinaMetadataquite closely. We then expose theGetHNSMetadata()so that when the metric module's process flow is invoked for each metric, the relevant info can be extractedThe metric module reads flows from our updated enricher and updates the required standalone metrics. These flows will be enriched if the pod name and namespace exists in the new cache.
In the HNS plugin, if standalone is activated, the plugin will take an enricher and send these flows via its internal ring buffer as others normally would for advanced metrics. Appropriate unit tests were added also.
Related Issue
#1547
Checklist
git commit -S -s ...). See this documentation on signing commits.Screenshots (if applicable) or Testing Completed
Full end to end was tested on a VM running DNC to simulate running pods
Additional Notes
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Please refer to the CONTRIBUTING.md file for more information on how to contribute to this project.