feat(om2.0): have one line for classic-native histogram#2863
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feat(om2.0): have one line for classic-native histogram#2863
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Otherwise rules around label set uniqeness, timestamps are violated. Also this should be more consistent and easier on the implementation. Signed-off-by: György Krajcsovits <gyorgy.krajcsovits@grafana.com>
dashpole
reviewed
Mar 4, 2026
dashpole
reviewed
Mar 4, 2026
dashpole
reviewed
Mar 4, 2026
| foo {count:17,sum:324789.3,bucket:[0.01:0,0.1:8,1.0:11,10.0:17,+Inf:17]} st@1520430000.123 # {} 0.054 1520879607.7 # {trace_id="KOO5S4vxi0o"} 0.67 1520879602.890 # {trace_id="oHg5SJYRHA0"} 9.8 1520879607.789 | ||
| ``` | ||
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| An example of a Histogram with Classic Buckets where the "0.01" bucket has no Exemplar. The 0.1 bucket has an Exemplar with no Labels. The 1 bucket has an Exemplar with one Label. The 10 bucket has an Exemplar with a Label and a timestamp. In practice all buckets SHOULD have the same style of Exemplars. |
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nit: prefer keeping normative language and examples separate.
dashpole
reviewed
Mar 4, 2026
| foo {count:17,sum:324789.3,bucket:[0.01:0,0.1:8,1.0:11,10.0:17,+Inf:17]} st@1520430000.123 # {} 0.054 1520879607.7 # {trace_id="KOO5S4vxi0o"} 0.67 1520879602.890 # {trace_id="oHg5SJYRHA0"} 9.8 1520879607.789 | ||
| ``` | ||
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| An example of a Histogram with Classic Buckets where the "0.01" bucket has no Exemplar. The 0.1 bucket has an Exemplar with no Labels. The 1 bucket has an Exemplar with one Label. The 10 bucket has an Exemplar with a Label and a timestamp. In practice all buckets SHOULD have the same style of Exemplars. |
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Nit: prefer phrasing as "Exemplar falls within the X bucket", rather than "X bucket has exemplar"
dashpole
reviewed
Mar 4, 2026
| foo {count:17,sum:324789.3,bucket:[0.01:0,0.1:8,1.0:11,10.0:17,+Inf:17]} st@1520430000.123 # {} 0.054 1520879607.7 # {trace_id="KOO5S4vxi0o"} 1.67 1520879602.890 # {trace_id="oHg5SJYRHA0"} 9.8 1520879607.789 | ||
| ``` | ||
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| An example of a Histogram with both Classic and Native Buckets, where the exemplars of only the Classic Buckets are |
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This would need to be updated if we changed the wording above
Signed-off-by: György Krajcsovits <gyorgy.krajcsovits@grafana.com>
krajorama
commented
Mar 5, 2026
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| If present, the MetricPoint's Start Timestamp MUST be inlined with the Metric point with a `st@` prefix. If the value's timestamp is present, the Start Timestamp MUST be added right after it. If exemplars are present, the Start Timestamp MUST be added before it. | ||
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| Exemplars without Labels MUST represent an empty LabelSet as {}. |
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Note to reviewers: let's move this to some common place.
krajorama
commented
Mar 5, 2026
| An example of Exemplars showcasing several valid cases: | ||
| The Histogram Sample with Native Buckets has multiple Exemplars. | ||
| The "0.01" bucket has no Exemplar. The 0.1 bucket has an Exemplar with no Labels. The 1 bucket has an Exemplar with one Label. The 10 bucket has an Exemplar with a Label and a timestamp. In practice all buckets SHOULD have the same style of Exemplars. | ||
| Exemplars of a MetricPoint SHOULD have the same Label names to have a consistent style. |
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Note to reviewers: let's move this to some common place.
dashpole
reviewed
Mar 9, 2026
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| Exemplars MAY be attached to the Histogram MetricPoint. | ||
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| When present, all Exemplars of the Histogram MetricPoint SHOULD be attached. |
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Not sure I understand this sentence. It sounds like it means "you should attach all exemplars you have for a histogram regardless of whether they are associated with classic or native buckets", but that clearly isn't what you mean below.
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Otherwise rules around label set uniqeness, timestamps are violated. Also this should be more consistent and easier on the implementation.