Function cardinality_eviction

nodedb/src/engine/timeseries/memtable.rs:474–509

()

    #[test]
    fn cardinality_eviction() {
        let config = MemtableConfig {
            max_memory_bytes: 10 * 1024 * 1024,
            max_series: 3,
            hard_memory_limit: 20 * 1024 * 1024,
        };
        let mut mt = TimeseriesMemtable::with_config(config);

        // Insert 3 series (at limit).
        for id in 0..3 {
            mt.ingest_metric(
                id,
                MetricSample {
                    timestamp_ms: 1000 + id as i64,
                    value: 1.0,
                },
            );
        }
        assert_eq!(mt.series_count(), 3);
        assert_eq!(mt.eviction_count(), 0);

        // Insert a 4th series — should evict the coldest.
        mt.ingest_metric(
            99,
            MetricSample {
                timestamp_ms: 5000,
                value: 99.0,
            },
        );
        assert_eq!(mt.series_count(), 3);
        assert_eq!(mt.eviction_count(), 1);

        // Drain should include the evicted series.
        let flushed = mt.drain();
        assert_eq!(flushed.len(), 4); // 3 active + 1 evicted
    }

    #[test]
    fn hard_limit_rejection() {