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[Feedback] ClickStack: correct exponential histogram schema #3897

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merged 3 commits into from
Jun 7, 2025
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[Feedback] ClickStack: correct exponential histogram schema #3897

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Correct exponential histogram schema
Blargian Jun 6, 2025
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Blargian Jun 6, 2025
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remove hard tabs
Blargian Jun 6, 2025
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38 changes: 23 additions & 15 deletions docs/use-cases/observability/clickstack/ingesting-data/schemas.md
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Original file line number Diff line number Diff line change
Expand Up @@ -208,14 +208,16 @@ CREATE TABLE otel_metrics_histogram
ENGINE = SharedMergeTree('/clickhouse/tables/{uuid}/{shard}', '{replica}')
PARTITION BY toDate(TimeUnix)
ORDER BY (ServiceName, MetricName, Attributes, toUnixTimestamp64Nano(TimeUnix))
SETTINGS index_granularity = 8192"
```

### Exponential histograms {#exponential-histograms}

:::note
HyperDX does not support fetching/displaying exponential histogram metrics yet. Users may configure them in the metrics source but future support is forthcoming.
:::

```sql
CREATE TABLE otel_metrics_histogram
(
CREATE TABLE otel_metrics_exponentialhistogram (
`ResourceAttributes` Map(LowCardinality(String), String) CODEC(ZSTD(1)),
`ResourceSchemaUrl` String CODEC(ZSTD(1)),
`ScopeName` String CODEC(ZSTD(1)),
Expand All @@ -228,18 +230,24 @@ CREATE TABLE otel_metrics_histogram
`MetricDescription` String CODEC(ZSTD(1)),
`MetricUnit` String CODEC(ZSTD(1)),
`Attributes` Map(LowCardinality(String), String) CODEC(ZSTD(1)),
`StartTimeUnix` DateTime64(9) CODEC(Delta(8), ZSTD(1)),
`TimeUnix` DateTime64(9) CODEC(Delta(8), ZSTD(1)),
`Count` UInt64 CODEC(Delta(8), ZSTD(1)),
`Sum` Float64 CODEC(ZSTD(1)),
`BucketCounts` Array(UInt64) CODEC(ZSTD(1)),
`ExplicitBounds` Array(Float64) CODEC(ZSTD(1)),
`Exemplars.FilteredAttributes` Array(Map(LowCardinality(String), String)) CODEC(ZSTD(1)),
`Exemplars.TimeUnix` Array(DateTime64(9)) CODEC(ZSTD(1)),
`Exemplars.Value` Array(Float64) CODEC(ZSTD(1)),
`Exemplars.SpanId` Array(String) CODEC(ZSTD(1)),
`Exemplars.TraceId` Array(String) CODEC(ZSTD(1)),
`Flags` UInt32 CODEC(ZSTD(1)),
`StartTimeUnix` DateTime64(9) CODEC(Delta, ZSTD(1)),
`TimeUnix` DateTime64(9) CODEC(Delta, ZSTD(1)),
`Count UInt64` CODEC(Delta, ZSTD(1)),
`Sum Float64` CODEC(ZSTD(1)),
`Scale Int32` CODEC(ZSTD(1)),
`ZeroCount` UInt64 CODEC(ZSTD(1)),
`PositiveOffset` Int32 CODEC(ZSTD(1)),
`PositiveBucketCounts` Array(UInt64) CODEC(ZSTD(1)),
`NegativeOffset` Int32 CODEC(ZSTD(1)),
`NegativeBucketCounts` Array(UInt64) CODEC(ZSTD(1)),
`Exemplars` Nested (
FilteredAttributes Map(LowCardinality(String), String),
TimeUnix DateTime64(9),
Value Float64,
SpanId String,
TraceId String
) CODEC(ZSTD(1)),
`Flags` UInt32 CODEC(ZSTD(1)),
`Min` Float64 CODEC(ZSTD(1)),
`Max` Float64 CODEC(ZSTD(1)),
`AggregationTemporality` Int32 CODEC(ZSTD(1)),
Expand Down