Prometheus: Add PrometheusQueryRangeResponseListener (ES|QL → Prometheus matrix JSON) + unit tests#144302
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Adds the ES|QL → Prometheus matrix JSON conversion layer:
- `PrometheusQueryRangeResponseListener` converts an `EsqlQueryResponse`
(columnar PROMQL output) into the Prometheus range query JSON format.
Handles two column modes:
* `_timeseries` JSON column — unwraps the `labels` namespace and
dot-flattens other namespaces.
* Individual label columns — maps each column name to a metric label.
Also converts epoch-ms timestamps to epoch-second doubles and formats
NaN / ±Inf sample values as Prometheus expects.
- `PrometheusQueryRangeResponseListenerTests` covers every conversion path,
edge cases (empty result, missing columns), error JSON building, and
special float formatting.
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.../java/org/elasticsearch/xpack/prometheus/rest/PrometheusQueryRangeResponseListenerTests.java
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…/prometheus/rest/PrometheusQueryRangeResponseListenerTests.java Co-authored-by: Sergey Sidorov <SERGEY.IVANOVICH.SIDOROV@gmail.com>
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Summary
This is PR 2 of 4 in a stacked series that adds the Prometheus
query_rangeendpoint.See the overview PR #144294 for context.
Stacks on top of #144301 — please review that PR first.
Adds the ES|QL → Prometheus matrix JSON conversion layer, independently reviewable without needing to know the REST wiring.
PrometheusQueryRangeResponseListenerListens for an
EsqlQueryResponseand converts its columnar PROMQL output into the Prometheus range query JSON format.PrometheusQueryRangeResponseListenerTestsUnit tests covering conversion paths, edge cases, error JSON mapping, and special float formatting.
Stacking order
/api/v1/query_range) endpoint #144303