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28 lines
1.5 KiB
Markdown
28 lines
1.5 KiB
Markdown
#### Alias patterns
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- replaced with measurement name
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- $measurement = replaced with measurement name
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- $1 - $9 = replaced with part of measurement name (if you separate your measurement name with dots)
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- $col = replaced with column name
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- $tag_exampletag = replaced with the value of the <i>exampletag</i> tag
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- You can also use [[tag_exampletag]] pattern replacement syntax
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#### Stacking and fill
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- When stacking is enabled it is important that points align
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- If there are missing points for one series it can cause gaps or missing bars
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- You must use fill(0), and select a group by time low limit
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- Use the group by time option below your queries and specify for example 10s if your metrics are written every 10 seconds
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- This will insert zeros for series that are missing measurements and will make stacking work properly
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#### Group by time
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- Group by time is important, otherwise the query could return many thousands of datapoints that will slow down Grafana
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- Leave the group by time field empty for each query and it will be calculated based on time range and pixel width of the graph
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- If you use fill(0) or fill(null) set a low limit for the auto group by time interval
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- The low limit can only be set in the group by time option below your queries
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- Example: 60s if you write metrics to InfluxDB every 60 seconds
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#### Documentation links:
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[Grafana's InfluxDB Documentation](http://docs.grafana.org/features/datasources/influxdb)
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[Official InfluxDB Documentation](https://docs.influxdata.com/influxdb)
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