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prom: add support for default step param (#9866)

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Alerting for prometheus have been depending on the step parameter from each query.
In https://github.com/grafana/grafana/pull/9226 we changed the behavior for step in the
frontend which caused problems for alerting. This commit fixes that by introducing a default
min interval value so alerting always have something to depend on. 

closes #9777
This commit is contained in:
Carl Bergquist
2017-11-15 11:22:00 +01:00
committed by GitHub
parent 9e6a7dcb90
commit 5d6ed6c45f
14 changed files with 237 additions and 69 deletions
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pkg/tsdb/prometheus/prometheus.go
+16 -10
View File
@@ -48,14 +48,16 @@ func NewPrometheusExecutor(dsInfo *models.DataSource) (tsdb.TsdbQueryEndpoint, e
}
var (
plog log.Logger
legendFormat *regexp.Regexp
plog log.Logger
legendFormat *regexp.Regexp
intervalCalculator tsdb.IntervalCalculator
)
func init() {
plog = log.New("tsdb.prometheus")
tsdb.RegisterTsdbQueryEndpoint("prometheus", NewPrometheusExecutor)
legendFormat = regexp.MustCompile(`\{\{\s*(.+?)\s*\}\}`)
intervalCalculator = tsdb.NewIntervalCalculator(&tsdb.IntervalOptions{MinInterval: time.Second * 1})
}
func (e *PrometheusExecutor) getClient(dsInfo *models.DataSource) (apiv1.API, error) {
@@ -88,7 +90,7 @@ func (e *PrometheusExecutor) Query(ctx context.Context, dsInfo *models.DataSourc
return nil, err
}
query, err := parseQuery(tsdbQuery.Queries, tsdbQuery)
query, err := parseQuery(dsInfo, tsdbQuery.Queries, tsdbQuery)
if err != nil {
return nil, err
}
@@ -138,7 +140,7 @@ func formatLegend(metric model.Metric, query *PrometheusQuery) string {
return string(result)
}
func parseQuery(queries []*tsdb.Query, queryContext *tsdb.TsdbQuery) (*PrometheusQuery, error) {
func parseQuery(dsInfo *models.DataSource, queries []*tsdb.Query, queryContext *tsdb.TsdbQuery) (*PrometheusQuery, error) {
queryModel := queries[0]
expr, err := queryModel.Model.Get("expr").String()
@@ -146,11 +148,6 @@ func parseQuery(queries []*tsdb.Query, queryContext *tsdb.TsdbQuery) (*Prometheu
return nil, err
}
step, err := queryModel.Model.Get("step").Int64()
if err != nil {
return nil, err
}
format := queryModel.Model.Get("legendFormat").MustString("")
start, err := queryContext.TimeRange.ParseFrom()
@@ -163,9 +160,18 @@ func parseQuery(queries []*tsdb.Query, queryContext *tsdb.TsdbQuery) (*Prometheu
return nil, err
}
dsInterval, err := tsdb.GetIntervalFrom(dsInfo, queryModel.Model, time.Second*15)
if err != nil {
return nil, err
}
intervalFactor := queryModel.Model.Get("intervalFactor").MustInt64(1)
interval := intervalCalculator.Calculate(queryContext.TimeRange, dsInterval)
step := time.Duration(int64(interval.Value) * intervalFactor)
return &PrometheusQuery{
Expr: expr,
Step: time.Second * time.Duration(step),
Step: step,
LegendFormat: format,
Start: start,
End: end,