05 · ENGINE

Metrics

GET /v1/metrics returns Prometheus text format. Every metric below is emitted unconditionally and has per-index labels where it makes sense.

Counters

docs_indexedTotal docs written.

queries_executedTotal queries served.

bytes_writtenBytes to segment + WAL.

bytes_readBytes read back from segments.

Histograms

query_latencyFull query path, in seconds.

index_latencyMemtable + WAL write path.

flush_durationMemtable → segment flush.

merge_durationSegment merge time.

wal_write_latencyWAL fsync latency.

Gauges

segment_countLive segments per index.

doc_countVisible docs per index.

memory_usageRSS in bytes.

active_searchesIn-flight queries.

wal_size_bytesLive WAL size.

Scrape config

# prometheus.yml
scrape_configs:
  - job_name: xerj
    metrics_path: /v1/metrics
    static_configs:
      - targets: ["xerj.internal:8080"]
    authorization:
      type: Bearer
      credentials: ${XERJ_API_KEY}

Source · engine/crates/common/src/metrics.rs

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