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docs/Single-server-VictoriaMetrics.md: sync with README.md

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docs/Single-server-VictoriaMetrics.md
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@ -85,6 +85,7 @@ Cluster version is available [here](https://github.com/VictoriaMetrics/VictoriaM
- [Federation](#federation)
- [Capacity planning](#capacity-planning)
- [High availability](#high-availability)
- [Deduplication](#deduplication)
- [Retention](#retention)
- [Multiple retentions](#multiple-retentions)
- [Downsampling](#downsampling)
@ -691,6 +692,19 @@ kill -HUP `pidof prometheus`
If you have Prometheus HA pairs with replicas `r1` and `r2` in each pair, then configure each `r1`
to write data to `victoriametrics-addr-1`, while each `r2` should write data to `victoriametrics-addr-2`.
Another option is to write data simultaneously from Prometheus HA pair to a pair of VictoriaMetrics instances
with the enabled de-duplication. See [this section](#deduplication) for details.
### Deduplication
VictoriaMetrics de-duplicates data points if `-dedup.minScrapeInterval` command-line flag
is set to positive duration. For example, `-dedup.minScrapeInterval=60s` would de-duplicate data points
on the same time series if they are located closer than 60s to each other.
The de-duplication reduces disk space usage if multiple identically configured Prometheus instances in HA pair
write data to the same VictoriaMetrics instance. Note that these Prometheus instances must have identical
`external_labels` section in their configs, so they write data to the same time series.
### Retention
@ -784,7 +798,7 @@ mkfs.ext4 ... -O 64bit,huge_file,extent -T huge
VictoriaMetrics exports internal metrics in Prometheus format at `/metrics` page.
These metrics may be collected either via Prometheus by adding the corresponding scrape config to it.
Alternatively they can be self-scraped by setting `-selfScrapeInterval` command-line flag to duration greater than 0.
For example, `-scrapeInterval=10s` would enable self-scraping of `/metrics` page with 10 seconds interval.
For example, `-selfScrapeInterval=10s` would enable self-scraping of `/metrics` page with 10 seconds interval.
There are officials Grafana dashboards for [single-node VictoriaMetrics](https://grafana.com/dashboards/10229) and [clustered VictoriaMetrics](https://grafana.com/grafana/dashboards/11176).