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om2: allow unknown fields #2846

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11 changes: 10 additions & 1 deletion docs/specs/om/open_metrics_spec_2_0.md
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Expand Up @@ -659,7 +659,16 @@ Floating point numbers MUST be represented either with a decimal point or using

###### CompositeValues

CompositeValue is represented as structured data with fields. There MUST NOT be any whitespace around fields. See the ABNF for exact details about the format and possible values.
CompositeValue is represented as structured data with fields. There MUST NOT be any whitespace around fields. See each of the composite type sections for the known field names. Ingestors MUST ignore unknown fields.

For example, the following histogram is valid:

```openmetrics-add-eof
# TYPE foo histogram
foo {newfield1:[],count:17,sum:324789.3,bucket:[0.0:0,1e-05:0,+Inf:17],newfield2:21,newfield3:{}} st@1520430000.123
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@bwplotka bwplotka Feb 18, 2026

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WG discussion:

  • There's order
  • Hard to for nested structures
  • Maybe new fields at the end? numbers and maybe slices?
  • Without unknowns and we want extend. 2.1 and content negotiation is fine?

```

See the ABNF for the further details about the format.

##### Timestamps

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