Skywalking: Add VictoriaMetrics storage backend

[valyala]

Please answer these questions before submitting your issue.

• Why do you submit this issue?
• [ ] Question or discussion
• [ ] Bug
• [ ] Requirement
• [x] Feature or performance improvement

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Requirement or improvement

It would be great to add VictoriaMetrics as storage backend for metrics collected by SkyWalking. VictoriaMetrics is optimized for speed and it provides the best on-disk compression ratio. It can accept metrics via any supported ingestion protocol:

• Prometheus remote_write protocol
• Influx line protocol
• Graphite plaintext protocol with tags
• OpenTSDB put protocol

Stored metrics can be queried either via PromQL or via /api/v1/export endpoint.

[wu-sheng]

Our storage APIs are open, if you have any proposal about how to implement those, we are glad to discuss the detail. @dmsolr is working on the prototype of using MySQL(or other traditional DB) + Influx DB to as a new storage option.

[valyala]

Thanks for the pointers! I and @dlazerka will look into how to add storage backend plugin for VictoriaMetrics.

[wu-sheng]

We have a document to show you the interfaces. After yoh read the design, consider to start from https://github.com/apache/skywalking/blob/master/docs/en/guides/storage-extention.md

We may have more interfaces listed there, but basic ideas are same.