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69edd8709b
Return annotations (warnings and infos) from PromQL queries This generalizes the warnings we have already used before (but only for problems with remote read) as "annotations". Annotations can be warnings or infos (the latter could be false positives). We do not treat them different in the API for now and return them all as "warnings". It would be easy to distinguish them and return infos separately, should that appear useful in the future. The new annotations are then used to create a lot of warnings or infos during PromQL evaluations. Partially these are things we have wanted for a long time (e.g. inform the user that they have applied `rate` to a metric that doesn't look like a counter), but the new native histograms have created even more needs for those annotations (e.g. if a query tries to aggregate float numbers with histograms). The annotations added here are not yet complete. A prominent example would be a warning about a range too short for a rate calculation. But such a warnings is more tricky to create with good fidelity and we will tackle it later. Another TODO is to take annotations into account when evaluating recording rules. --------- Signed-off-by: Jeanette Tan <jeanette.tan@grafana.com>
98 lines
2.7 KiB
Go
98 lines
2.7 KiB
Go
// Copyright 2017 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package storage
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import (
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"context"
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"github.com/prometheus/prometheus/model/labels"
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"github.com/prometheus/prometheus/util/annotations"
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)
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type noopQuerier struct{}
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// NoopQuerier is a Querier that does nothing.
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func NoopQuerier() Querier {
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return noopQuerier{}
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}
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func (noopQuerier) Select(context.Context, bool, *SelectHints, ...*labels.Matcher) SeriesSet {
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return NoopSeriesSet()
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}
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func (noopQuerier) LabelValues(context.Context, string, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
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return nil, nil, nil
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}
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func (noopQuerier) LabelNames(context.Context, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
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return nil, nil, nil
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}
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func (noopQuerier) Close() error {
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return nil
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}
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type noopChunkQuerier struct{}
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// NoopChunkedQuerier is a ChunkQuerier that does nothing.
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func NoopChunkedQuerier() ChunkQuerier {
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return noopChunkQuerier{}
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}
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func (noopChunkQuerier) Select(context.Context, bool, *SelectHints, ...*labels.Matcher) ChunkSeriesSet {
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return NoopChunkedSeriesSet()
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}
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func (noopChunkQuerier) LabelValues(context.Context, string, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
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return nil, nil, nil
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}
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func (noopChunkQuerier) LabelNames(context.Context, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
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return nil, nil, nil
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}
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func (noopChunkQuerier) Close() error {
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return nil
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}
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type noopSeriesSet struct{}
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// NoopSeriesSet is a SeriesSet that does nothing.
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func NoopSeriesSet() SeriesSet {
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return noopSeriesSet{}
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}
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func (noopSeriesSet) Next() bool { return false }
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func (noopSeriesSet) At() Series { return nil }
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func (noopSeriesSet) Err() error { return nil }
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func (noopSeriesSet) Warnings() annotations.Annotations { return nil }
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type noopChunkedSeriesSet struct{}
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// NoopChunkedSeriesSet is a ChunkSeriesSet that does nothing.
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func NoopChunkedSeriesSet() ChunkSeriesSet {
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return noopChunkedSeriesSet{}
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}
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func (noopChunkedSeriesSet) Next() bool { return false }
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func (noopChunkedSeriesSet) At() ChunkSeries { return nil }
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func (noopChunkedSeriesSet) Err() error { return nil }
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func (noopChunkedSeriesSet) Warnings() annotations.Annotations { return nil }
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