Add PromQL query support for dashboard visualizations (ticket 013)

Hand-rolls a minimal PromQL parser (src/promql.rs) for metric-name +
label-matcher selection, optional [range] selectors, and top-level
sum()/avg()/rate() wrapping, rather than pulling in a full PromQL parser
crate — the required subset is small and a hand-rolled parser stays fully
engine-independent (mirrors filter_parser.rs) with no unused-AST overhead.

Adds EngineQuery::Promql/EngineResponse::Promql (engine parses + evaluates
in place against the index, no copying) and GET /api/query, returning
Vec<PromqlSeriesDto> (labels + (timestamp_ms, f64) points) for charting,
with malformed queries surfaced as 400 + ErrorDto.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XFUNZwCvz3kcod3352ZR2o

This commit is contained in:

Hugh Kaznowski

2026-09-05 13:10:41 +01:00

co-authored by

Claude Sonnet 5

parent e48c03218f

commit ac67f9e120

5 changed files with 727 additions and 3 deletions

									
										src/main.rs
									
		+1
		
												View File
												
				@@ -8,6 +8,7 @@ mod index_key;

				mod ingest;

				mod metric_primitive;

				mod profile;

				mod promql;

				mod settings;

				mod timestamp;