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docs/keyConcepts.md: cosmetic fixes after b67bd156d5

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Aliaksandr Valialkin 2023-07-12 00:28:44 -07:00
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docs/keyConcepts.md
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@ -744,21 +744,22 @@ If you need to export raw samples from VictoriaMetrics, then take a look at [exp
### Query latency
By default, Victoria Metrics does not immediately return the recently written samples. Instead, it retrieves the last results written prior to the time specified by the `search.latencyOffset` flag, which has a default offset of 30 seconds.
By default, Victoria Metrics does not immediately return the recently written samples. Instead, it retrieves the last results
written prior to the time specified by the `-search.latencyOffset` command-line flag, which has a default offset of 30 seconds.
This is true for both `query` and `query_range` and may give the impression that data is written to the VM with a 30-second delay.
But this flag avoids non-consistent results due to the fact that only part of the values are scraped in the last scrape interval.
This flag prevents from non-consistent results due to the fact that only part of the values are scraped in the last scrape interval.
Here is an illustration of a potential problem when `search.latencyOffset` is set to zero:
Here is an illustration of a potential problem when `-search.latencyOffset` is set to zero:
<img src="keyConcepts_without_latencyOffset.png" width="1000">
When this flag is set, the VM will return the last metric value collected before the `search.latencyOffset`
duration throughout the `search.latencyOffset` duration:
When this flag is set, the VM will return the last metric value collected before the `-search.latencyOffset`
duration throughout the `-search.latencyOffset` duration:
<img src="keyConcepts_with_latencyOffset.png" width="1000">
It can be overridden on per-query basis via `latency_offset` arg.
It can be overridden on per-query basis via `latency_offset` query arg.
### MetricsQL