mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
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7d9c4bebc0
docs: update links to grafana dashboards Signed-off-by: Artem Navoiev <tenmozes@gmail.com>
345 lines
11 KiB
Go
345 lines
11 KiB
Go
// Code generated by qtc from "expand-with-exprs.qtpl". DO NOT EDIT.
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// See https://github.com/valyala/quicktemplate for details.
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:1
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package prometheus
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:1
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import (
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"github.com/VictoriaMetrics/metricsql"
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)
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// ExpandWithExprsResponse returns a webpage, which expands with templates in q MetricsQL.
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:8
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import (
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qtio422016 "io"
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qt422016 "github.com/valyala/quicktemplate"
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)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:8
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var (
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_ = qtio422016.Copy
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_ = qt422016.AcquireByteBuffer
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)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:8
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func StreamExpandWithExprsResponse(qw422016 *qt422016.Writer, q string) {
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:8
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qw422016.N().S(`<html><head><title>Expand WITH expressions</title><style>p { font-weight: bold }textarea { margin: 1em }</style></head><body><div><form method="get"><div><p><a href="https://docs.victoriametrics.com/MetricsQL.html">MetricsQL</a> query with optional WITH expressions:</p><textarea name="query" style="height: 15em; width: 90%">`)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:25
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qw422016.E().S(q)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:25
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qw422016.N().S(`</textarea><br/><input type="submit" value="Expand" /><p><a href="https://docs.victoriametrics.com/MetricsQL.html">MetricsQL</a> query after expanding WITH expressions and applying other optimizations:</p><textarea style="height: 5em; width: 90%" readonly="readonly">`)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:31
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streamexpandWithExprs(qw422016, q)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:31
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qw422016.N().S(`</textarea></div></form></div><div>`)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:36
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streamwithExprsTutorial(qw422016)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:36
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qw422016.N().S(`</div></body></html>`)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:40
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}
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:40
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func WriteExpandWithExprsResponse(qq422016 qtio422016.Writer, q string) {
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:40
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qw422016 := qt422016.AcquireWriter(qq422016)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:40
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StreamExpandWithExprsResponse(qw422016, q)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:40
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qt422016.ReleaseWriter(qw422016)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:40
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}
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:40
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func ExpandWithExprsResponse(q string) string {
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:40
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qb422016 := qt422016.AcquireByteBuffer()
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:40
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WriteExpandWithExprsResponse(qb422016, q)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:40
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qs422016 := string(qb422016.B)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:40
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qt422016.ReleaseByteBuffer(qb422016)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:40
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return qs422016
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:40
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}
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:42
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func streamexpandWithExprs(qw422016 *qt422016.Writer, q string) {
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:43
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if len(q) == 0 {
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:44
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return
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:45
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}
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:47
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expr, err := metricsql.Parse(q)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:48
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if err != nil {
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:48
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qw422016.N().S(`Cannot parse query:`)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:49
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qw422016.E().V(err)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:50
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} else {
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:51
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expr = metricsql.Optimize(expr)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:52
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qw422016.E().Z(expr.AppendString(nil))
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:53
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}
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:54
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}
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:54
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func writeexpandWithExprs(qq422016 qtio422016.Writer, q string) {
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:54
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qw422016 := qt422016.AcquireWriter(qq422016)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:54
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streamexpandWithExprs(qw422016, q)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:54
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qt422016.ReleaseWriter(qw422016)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:54
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}
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:54
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func expandWithExprs(q string) string {
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:54
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qb422016 := qt422016.AcquireByteBuffer()
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:54
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writeexpandWithExprs(qb422016, q)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:54
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qs422016 := string(qb422016.B)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:54
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qt422016.ReleaseByteBuffer(qb422016)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:54
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return qs422016
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:54
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}
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:58
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func streamwithExprsTutorial(qw422016 *qt422016.Writer) {
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:58
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qw422016.N().S(`
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<h3>Tutorial for WITH expressions in <a href="https://docs.victoriametrics.com/MetricsQL.html">MetricsQL</a></h3>
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<p>
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Let's look at the following real query from <a href="https://grafana.com/grafana/dashboards/1860-node-exporter-full/">Node Exporter Full</a> dashboard:
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</p>
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<pre>
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(
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(
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node_memory_MemTotal_bytes{instance=~"$node:$port", job=~"$job"}
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-
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node_memory_MemFree_bytes{instance=~"$node:$port", job=~"$job"}
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)
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/
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node_memory_MemTotal_bytes{instance=~"$node:$port", job=~"$job"}
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)
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*
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100
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</pre>
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<p>
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It is clear the query calculates the percentage of used memory
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for the given $node, $port and $job. Isn't it? :)
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</p>
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<p>
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What's wrong with this query? Copy-pasted label filters for distinct timeseries
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which makes it easy to mistype these filters during modification.
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Let's simplify the query with WITH expressions:
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</p>
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<pre>
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WITH (
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commonFilters = {instance=~"$node:$port",job=~"$job"}
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)
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(
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node_memory_MemTotal_bytes{commonFilters}
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-
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node_memory_MemFree_bytes{commonFilters}
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)
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/
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node_memory_MemTotal_bytes{commonFilters} * 100
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</pre>
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<p>
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Now label filters are located in a single place instead of three distinct places.
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The query mentions node_memory_MemTotal_bytes metric twice and {commonFilters}
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three times. WITH expressions may improve this:
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</p>
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<pre>
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WITH (
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my_resource_utilization(free, limit, filters) = (limit{filters} - free{filters}) / limit{filters} * 100
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)
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my_resource_utilization(
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node_memory_MemFree_bytes,
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node_memory_MemTotal_bytes,
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{instance=~"$node:$port",job=~"$job"},
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)
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</pre>
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<p>
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Now the template function my_resource_utilization() may be used for monitoring arbitrary
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resources - memory, CPU, network, storage, you name it.
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</p>
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<p>
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Let's take another nice query from <a href="https://grafana.com/grafana/dashboards/1860-node-exporter-full/">Node Exporter Full</a> dashboard:
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</p>
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<pre>
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(
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(
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(
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count(
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count(node_cpu_seconds_total{instance=~"$node:$port",job=~"$job"}) by (cpu)
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)
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)
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-
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avg(
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sum by (mode) (rate(node_cpu_seconds_total{mode='idle',instance=~"$node:$port",job=~"$job"}[5m]))
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)
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)
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*
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100
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)
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/
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count(
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count(node_cpu_seconds_total{instance=~"$node:$port",job=~"$job"}) by (cpu)
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)
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</pre>
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<p>
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Do you understand what does this mess do? Is it manageable? :) WITH expressions are happy to help in a few iterations.
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<br/>
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<br/>
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1. Extract common filters used in multiple places into a commonFilters variable:
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</p>
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<pre>
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WITH (
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commonFilters = {instance=~"$node:$port",job=~"$job"}
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)
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(
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(
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(
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count(
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count(node_cpu_seconds_total{commonFilters}) by (cpu)
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)
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)
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-
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avg(
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sum by (mode) (rate(node_cpu_seconds_total{mode='idle',commonFilters}[5m]))
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)
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)
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*
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100
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)
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/
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count(
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count(node_cpu_seconds_total{commonFilters}) by (cpu)
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)
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</pre>
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<p>
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2. Extract "count(count(...) by (cpu))" into cpuCount variable:
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</p>
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<pre>
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WITH (
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commonFilters = {instance=~"$node:$port",job=~"$job"},
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cpuCount = count(count(node_cpu_seconds_total{commonFilters}) by (cpu))
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)
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(
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(
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cpuCount
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-
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avg(
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sum by (mode) (rate(node_cpu_seconds_total{mode='idle',commonFilters}[5m]))
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)
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)
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*
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100
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) / cpuCount
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</pre>
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<p>
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3. Extract rate(...) part into cpuIdle variable, since it is clear now that this part calculates the number of idle CPUs:
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</p>
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<pre>
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WITH (
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commonFilters = {instance=~"$node:$port",job=~"$job"},
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cpuCount = count(count(node_cpu_seconds_total{commonFilters}) by (cpu)),
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cpuIdle = sum(rate(node_cpu_seconds_total{mode='idle',commonFilters}[5m]))
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)
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((cpuCount - cpuIdle) * 100) / cpuCount
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</pre>
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<p>
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4. Put node_cpu_seconds_total{commonFilters} into its own varialbe with the name cpuSeconds:
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</p>
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<pre>
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WITH (
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cpuSeconds = node_cpu_seconds_total{instance=~"$node:$port",job=~"$job"},
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cpuCount = count(count(cpuSeconds) by (cpu)),
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cpuIdle = sum(rate(cpuSeconds{mode='idle'}[5m]))
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)
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((cpuCount - cpuIdle) * 100) / cpuCount
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</pre>
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<p>
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Now the query became more clear comparing to the initial query.
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</p>
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<p>
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WITH expressions may be nested and may be put anywhere. Try expanding the following query:
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</p>
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<pre>
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WITH (
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f(a, b) = WITH (
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f1(x) = b-x,
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f2(x) = x+x
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) f1(a)*f2(b)
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) f(foo, with(x=bar) x)
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</pre>
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`)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:245
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}
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:245
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func writewithExprsTutorial(qq422016 qtio422016.Writer) {
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:245
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qw422016 := qt422016.AcquireWriter(qq422016)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:245
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streamwithExprsTutorial(qw422016)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:245
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qt422016.ReleaseWriter(qw422016)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:245
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}
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:245
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func withExprsTutorial() string {
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:245
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qb422016 := qt422016.AcquireByteBuffer()
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:245
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writewithExprsTutorial(qb422016)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:245
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qs422016 := string(qb422016.B)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:245
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qt422016.ReleaseByteBuffer(qb422016)
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:245
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return qs422016
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//line app/vmselect/prometheus/expand-with-exprs.qtpl:245
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}
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