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9e500345f3
So far, if a target exposes a histogram with both classic and native buckets, a native-histogram enabled Prometheus would ignore the classic buckets. With the new scrape config option `scrape_classic_histograms` set, both buckets will be ingested, creating all the series of a classic histogram in parallel to the native histogram series. For example, a histogram `foo` would create a native histogram series `foo` and classic series called `foo_sum`, `foo_count`, and `foo_bucket`. This feature can be used in a migration strategy from classic to native histograms, where it is desired to have a transition period during which both native and classic histograms are present. Note that two bugs in classic histogram parsing were found and fixed as a byproduct of testing the new feature: 1. Series created from classic _gauge_ histograms didn't get the _sum/_count/_bucket prefix set. 2. Values of classic _float_ histograms weren't parsed properly. Signed-off-by: beorn7 <beorn@grafana.com>
105 lines
2.9 KiB
Go
105 lines
2.9 KiB
Go
// Copyright 2022 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 textparse
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import (
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"testing"
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"github.com/stretchr/testify/require"
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)
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func TestNewParser(t *testing.T) {
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t.Parallel()
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requirePromParser := func(t *testing.T, p Parser) {
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require.NotNil(t, p)
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_, ok := p.(*PromParser)
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require.True(t, ok)
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}
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requireOpenMetricsParser := func(t *testing.T, p Parser) {
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require.NotNil(t, p)
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_, ok := p.(*OpenMetricsParser)
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require.True(t, ok)
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}
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for name, tt := range map[string]*struct {
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contentType string
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validateParser func(*testing.T, Parser)
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err string
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}{
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"empty-string": {
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validateParser: requirePromParser,
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},
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"invalid-content-type-1": {
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contentType: "invalid/",
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validateParser: requirePromParser,
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err: "expected token after slash",
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},
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"invalid-content-type-2": {
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contentType: "invalid/invalid/invalid",
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validateParser: requirePromParser,
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err: "unexpected content after media subtype",
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},
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"invalid-content-type-3": {
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contentType: "/",
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validateParser: requirePromParser,
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err: "no media type",
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},
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"invalid-content-type-4": {
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contentType: "application/openmetrics-text; charset=UTF-8; charset=utf-8",
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validateParser: requirePromParser,
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err: "duplicate parameter name",
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},
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"openmetrics": {
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contentType: "application/openmetrics-text",
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validateParser: requireOpenMetricsParser,
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},
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"openmetrics-with-charset": {
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contentType: "application/openmetrics-text; charset=utf-8",
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validateParser: requireOpenMetricsParser,
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},
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"openmetrics-with-charset-and-version": {
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contentType: "application/openmetrics-text; version=1.0.0; charset=utf-8",
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validateParser: requireOpenMetricsParser,
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},
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"plain-text": {
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contentType: "text/plain",
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validateParser: requirePromParser,
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},
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"plain-text-with-version": {
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contentType: "text/plain; version=0.0.4",
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validateParser: requirePromParser,
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},
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"some-other-valid-content-type": {
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contentType: "text/html",
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validateParser: requirePromParser,
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},
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} {
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t.Run(name, func(t *testing.T) {
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tt := tt // Copy to local variable before going parallel.
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t.Parallel()
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p, err := New([]byte{}, tt.contentType, false)
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tt.validateParser(t, p)
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if tt.err == "" {
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require.NoError(t, err)
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} else {
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require.Error(t, err)
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require.Contains(t, err.Error(), tt.err)
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}
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})
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}
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}
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