Slow query log

SlowQueryLog writes one JSON line per query that exceeds a latency threshold.

Setup

using Rowles.LeanCorpus.Diagnostics;
using Rowles.LeanCorpus.Search.Searcher;

using var slowLog = SlowQueryLog.ToFile(
    thresholdMs: 50.0,
    filePath: "./slow-queries.jsonl");

var config = new IndexSearcherConfig { SlowQueryLog = slowLog };
using var searcher = new IndexSearcher(dir, config);

Or write to any TextWriter:

var writer = new StringWriter();
var log = new SlowQueryLog(thresholdMs: 25.0, writer);

Entry format

Each line: Timestamp (UTC), QueryType, Query (string form), ElapsedMs, TotalHits. The file is JSON Lines.

See also

• SlowQueryLog