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README.md: mention that delete API
shouldnt be used on a regular basis due to non-zero overhead
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@ -8,8 +8,10 @@ in [source code](https://github.com/VictoriaMetrics/VictoriaMetrics). Just downl
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Cluster version is available [here](https://github.com/VictoriaMetrics/VictoriaMetrics/tree/cluster).
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## Case studies
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## Case studies and talks
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* [Adidas](https://github.com/VictoriaMetrics/VictoriaMetrics/wiki/CaseStudies#adidas)
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* [COLOPL](https://github.com/VictoriaMetrics/VictoriaMetrics/wiki/CaseStudies#colopl)
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* [Wix.com](https://github.com/VictoriaMetrics/VictoriaMetrics/wiki/CaseStudies#wixcom)
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* [Wedos.com](https://github.com/VictoriaMetrics/VictoriaMetrics/wiki/CaseStudies#wedoscom)
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* [Dreamteam](https://github.com/VictoriaMetrics/VictoriaMetrics/wiki/CaseStudies#dreamteam)
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@ -520,6 +522,19 @@ the deleted time series isn't freed instantly - it is freed during subsequent me
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It is recommended verifying which metrics will be deleted with the call to `http://<victoria-metrics-addr>:8428/api/v1/series?match[]=<timeseries_selector_for_delete>`
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before actually deleting the metrics.
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The delete API is intended mainly for the following cases:
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- One-off deleting of accidentally written invalid (or undesired) time series.
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- One-off deleting of user data due to [GDPR](https://en.wikipedia.org/wiki/General_Data_Protection_Regulation).
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It isn't recommended using delete API for the following cases, since it brings non-zero overhead:
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- Regular cleanups for unneded data. Just prevent writing unneeded data into VictoriaMetrics.
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- Reducing disk space usage by deleting unneded time series. This doesn't work as expected, since the deleted
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time series occupy disk space until the next merge operation, which can never occur.
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It is better using `-retentionPeriod` command-line flag for efficient pruning of old data.
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### How to export time series?
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@ -767,6 +782,7 @@ The most interesting metrics are:
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### Backfilling
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VictoriaMetrics accepts historical data in arbitrary order of time.
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Make sure that configured `-retentionPeriod` covers timestamps for the backfilled data.
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It is recommended disabling query cache with `-search.disableCache` command-line flag when writing
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