Add VM switch guide for TiUP cluster #20957
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Signed-off-by: nolouch <[email protected]>
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Hello @nolouch, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
Summary of Changes
Hello team, gemini-code-assist here to provide a summary of this pull request. This PR introduces a new section to the maintain-tidb-using-tiup.md documentation. The purpose of this new section is to guide users on how to switch their monitoring system from the default Prometheus to VictoriaMetrics within a TiUP-managed TiDB cluster. This change is motivated by the potential efficiency challenges Prometheus can face in large clusters, with VictoriaMetrics offering better scalability and performance.
Highlights
- New Documentation Section: Adds a comprehensive guide on switching monitoring from Prometheus to VictoriaMetrics.
- VictoriaMetrics Benefits: Explains why users might want to switch, highlighting VictoriaMetrics' scalability, performance, and lower resource consumption.
- Configuration for New Deployments: Provides instructions on configuring the TiUP topology file (
prom_remote_write_to_vm,enable_prom_agent_mode,use_vm_as_datasource) for new clusters using VictoriaMetrics. - Migration Guide for Existing Clusters: Details a step-by-step process for migrating an existing cluster to use VictoriaMetrics without affecting running instances, including enabling remote write and switching Grafana data sources.
- Cleanup Procedures: Includes instructions for setting Prometheus to agent mode and manually removing old Prometheus data directories after migration.
Changelog
- maintain-tidb-using-tiup.md
- Added a new top-level section titled 'Switch from Prometheus to VictoriaMetrics'.
- Included subsections for setting up VM for new deployments, migrating existing deployments, viewing historical metrics (optional), and cleaning up old data/services.
- Provided YAML configuration snippets and
tiup clustercommands for the migration steps.
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Code Review
This pull request adds a valuable guide on switching from Prometheus to VictoriaMetrics for TiUP clusters. The new section is well-structured, clearly explaining the process for both new deployments and existing migrations, including cleanup steps. The use of headings, ordered lists, and code blocks generally follows the documentation style guide. I've identified a few minor areas for improvement related to clarity and adherence to the style guide's preference for active voice.
Summary of Findings
- Passive Voice and Sentence Structure: Identified instances of passive voice and a comma splice that could be rephrased for better clarity and adherence to the style guide's preference for active voice and clear sentence structure.
Merge Readiness
The documentation changes are a valuable addition and are mostly in good shape. I've provided a couple of suggestions related to passive voice and sentence structure for improved clarity and style guide adherence. Addressing these suggestions would enhance the quality of the documentation. I recommend making these changes before merging. As a code reviewer, I am unable to directly approve the pull request; please ensure other reviewers approve this code before merging.
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| ### Migrate an existing deployment to VictoriaMetrics | ||
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| The migration process can be performed without affecting running instances. Existing metrics will remain in Prometheus, while new metrics will be written to VictoriaMetrics. |
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This sentence uses passive voice and is a comma splice1. To improve clarity and adhere to the style guide's preference for active voice and clear sentence structure2, consider splitting it into two sentences and rephrasing.
Style Guide References
| The migration process can be performed without affecting running instances. Existing metrics will remain in Prometheus, while new metrics will be written to VictoriaMetrics. | |
| You can perform the migration process without affecting running instances. Existing metrics will remain in Prometheus, and TiUP will write new metrics to VictoriaMetrics. |
Footnotes
| tiup cluster edit-config ${cluster-name} | ||
| ``` | ||
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| 2. Under `monitoring_servers`, set `enable_prom_agent_mode` to `true`, and ensure `prom_remote_write_to_vm` and `use_vm_as_datasource` are also set correctly: |
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This phrase uses passive voice1. Consider rephrasing it using active voice to adhere to the style guide2.
Style Guide References
| 2. Under `monitoring_servers`, set `enable_prom_agent_mode` to `true`, and ensure `prom_remote_write_to_vm` and `use_vm_as_datasource` are also set correctly: | |
| 2. Under `monitoring_servers`, set `enable_prom_agent_mode` to `true`, and ensure you also set `prom_remote_write_to_vm` and `use_vm_as_datasource` correctly: |
Footnotes
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