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Hook OpenMetrics parser into scraping.

Browse source 
Extend metadata api to support units.

Signed-off-by: Brian Brazil <brian.brazil@robustperception.io>
This commit is contained in:
Brian Brazil 2018-10-05 17:11:16 +01:00
parent c271ef456a
commit 9c03e11c2c
6 changed files with 53 additions and 14 deletions
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12
docs/querying/api.md
View file

@ -499,7 +499,8 @@ curl -G http://localhost:9091/api/v1/targets/metadata \
"job": "prometheus"
},
"type": "gauge",
"help": "Number of goroutines that currently exist."
"help": "Number of goroutines that currently exist.",
"unit": ""
},
{
"target": {
@ -507,7 +508,8 @@ curl -G http://localhost:9091/api/v1/targets/metadata \
"job": "prometheus"
},
"type": "gauge",
"help": "Number of goroutines that currently exist."
"help": "Number of goroutines that currently exist.",
"unit": ""
}
]
}
@ -530,7 +532,8 @@ curl -G http://localhost:9091/api/v1/targets/metadata \
},
"metric": "prometheus_treecache_zookeeper_failures_total",
"type": "counter",
"help": "The total number of ZooKeeper failures."
"help": "The total number of ZooKeeper failures.",
"unit": ""
},
{
"target": {
@ -539,7 +542,8 @@ curl -G http://localhost:9091/api/v1/targets/metadata \
},
"metric": "prometheus_tsdb_reloads_total",
"type": "counter",
"help": "Number of times the database reloaded block data from disk."
"help": "Number of times the database reloaded block data from disk.",
"unit": ""
},
// ...
]

6
pkg/textparse/interface.go
View file

@ -14,6 +14,8 @@
package textparse
import (
"mime"
"github.com/prometheus/prometheus/pkg/labels"
)
@ -55,6 +57,10 @@ type Parser interface {
// New returns a new parser of the byte slice.
func New(b []byte, contentType string) Parser {
mediaType, _, err := mime.ParseMediaType(contentType)
if err == nil && mediaType == "application/openmetrics-text" {
return NewOMParser(b)
}
return NewPromParser(b)
}

28
scrape/scrape.go
View file

@ -451,7 +451,7 @@ type targetScraper struct {
buf *bufio.Reader
}
const acceptHeader = `text/plain;version=0.0.4;q=1,*/*;q=0.1`
const acceptHeader = `application/openmetrics-text; version=0.0.1,text/plain;version=0.0.4;q=0.5,*/*;q=0.1`
var userAgentHeader = fmt.Sprintf("Prometheus/%s", version.Version)
@ -565,6 +565,7 @@ type metaEntry struct {
lastIter uint64 // Last scrape iteration the entry was observed at.
typ textparse.MetricType
help string
unit string
}
func newScrapeCache() *scrapeCache {
@ -659,7 +660,7 @@ func (c *scrapeCache) setType(metric []byte, t textparse.MetricType) {
e, ok := c.metadata[yoloString(metric)]
if !ok {
e = &metaEntry{typ: textparse.MetricTypeUntyped}
e = &metaEntry{typ: textparse.MetricTypeUnknown}
c.metadata[string(metric)] = e
}
e.typ = t
@ -673,7 +674,7 @@ func (c *scrapeCache) setHelp(metric, help []byte) {
e, ok := c.metadata[yoloString(metric)]
if !ok {
e = &metaEntry{typ: textparse.MetricTypeUntyped}
e = &metaEntry{typ: textparse.MetricTypeUnknown}
c.metadata[string(metric)] = e
}
if e.help != yoloString(help) {
@ -684,6 +685,22 @@ func (c *scrapeCache) setHelp(metric, help []byte) {
c.metaMtx.Unlock()
}
func (c *scrapeCache) setUnit(metric, unit []byte) {
c.metaMtx.Lock()
e, ok := c.metadata[yoloString(metric)]
if !ok {
e = &metaEntry{typ: textparse.MetricTypeUnknown}
c.metadata[string(metric)] = e
}
if e.unit != yoloString(unit) {
e.unit = string(unit)
}
e.lastIter = c.iter
c.metaMtx.Unlock()
}
func (c *scrapeCache) getMetadata(metric string) (MetricMetadata, bool) {
c.metaMtx.Lock()
defer c.metaMtx.Unlock()
@ -696,6 +713,7 @@ func (c *scrapeCache) getMetadata(metric string) (MetricMetadata, bool) {
Metric: metric,
Type: m.typ,
Help: m.help,
Unit: m.unit,
}, true
}
@ -710,6 +728,7 @@ func (c *scrapeCache) listMetadata() []MetricMetadata {
Metric: m,
Type: e.typ,
Help: e.help,
Unit: e.unit,
})
}
return res
@ -951,6 +970,9 @@ loop:
case textparse.EntryHelp:
sl.cache.setHelp(p.Help())
continue
case textparse.EntryUnit:
sl.cache.setUnit(p.Unit())
continue
case textparse.EntryComment:
continue
default:

17
scrape/scrape_test.go
View file

@ -615,13 +615,13 @@ func TestScrapeLoopMetadata(t *testing.T) {
)
defer cancel()
total, _, err := sl.append([]byte(`
# TYPE test_metric counter
total, _, err := sl.append([]byte(`# TYPE test_metric counter
# HELP test_metric some help text
# other comment
# UNIT test_metric metric
test_metric 1
# TYPE test_metric_no_help gauge
# HELP test_metric_no_type other help text`), "", time.Now())
# HELP test_metric_no_type other help text
# EOF`), "application/openmetrics-text", time.Now())
testutil.Ok(t, err)
testutil.Equals(t, 1, total)
@ -629,16 +629,19 @@ test_metric 1
testutil.Assert(t, ok, "expected metadata to be present")
testutil.Assert(t, textparse.MetricTypeCounter == md.Type, "unexpected metric type")
testutil.Equals(t, "some help text", md.Help)
testutil.Equals(t, "metric", md.Unit)
md, ok = cache.getMetadata("test_metric_no_help")
testutil.Assert(t, ok, "expected metadata to be present")
testutil.Assert(t, textparse.MetricTypeGauge == md.Type, "unexpected metric type")
testutil.Equals(t, "", md.Help)
testutil.Equals(t, "", md.Unit)
md, ok = cache.getMetadata("test_metric_no_type")
testutil.Assert(t, ok, "expected metadata to be present")
testutil.Assert(t, textparse.MetricTypeUntyped == md.Type, "unexpected metric type")
testutil.Assert(t, textparse.MetricTypeUnknown == md.Type, "unexpected metric type")
testutil.Equals(t, "other help text", md.Help)
testutil.Equals(t, "", md.Unit)
}
func TestScrapeLoopRunCreatesStaleMarkersOnFailedScrape(t *testing.T) {
@ -1177,8 +1180,8 @@ func TestTargetScraperScrapeOK(t *testing.T) {
server := httptest.NewServer(
http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
accept := r.Header.Get("Accept")
if !strings.HasPrefix(accept, "text/plain;") {
t.Errorf("Expected Accept header to prefer text/plain, got %q", accept)
if !strings.HasPrefix(accept, "application/openmetrics-text;") {
t.Errorf("Expected Accept header to prefer application/openmetrics-text, got %q", accept)
}
timeout := r.Header.Get("X-Prometheus-Scrape-Timeout-Seconds")

1
scrape/target.go
View file

@ -85,6 +85,7 @@ type MetricMetadata struct {
Metric string
Type textparse.MetricType
Help string
Unit string
}
func (t *Target) MetadataList() []MetricMetadata {

3
web/api/v1/api.go
View file

@ -573,6 +573,7 @@ Outer:
Metric: md.Metric,
Type: md.Type,
Help: md.Help,
Unit: md.Unit,
})
}
continue
@ -583,6 +584,7 @@ Outer:
Target: t.Labels(),
Type: md.Type,
Help: md.Help,
Unit: md.Unit,
})
}
}
@ -598,6 +600,7 @@ type metricMetadata struct {
Metric string `json:"metric,omitempty"`
Type textparse.MetricType `json:"type"`
Help string `json:"help"`
Unit string `json:"unit"`
}
// AlertmanagerDiscovery has all the active Alertmanagers.