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Index Service Metrics

    March 16, 2025
    + 12
    A list of the metrics provided by the Index Service.

    The following Index-Service metrics can be queried by means of the REST APIs described in Statistics.

    Tip

    • The x.y.z badge shows the Couchbase Server version the metric was added in.

    • The type / unit badge shows shows the Prometheus type and unit (if present).

    index_avg_disk_bps     7.2.0gauge

    Sum of disk bytes written per second, of all indexes, located on this node

    index_avg_drain_rate     7.0.0gauge

    Average number of documents indexed per second, for this index

    index_avg_item_size     7.0.0gauge / bytes

    Average size of the indexed items, for this index

    index_avg_mutation_rate     7.2.0gauge

    Sum of mutation rates of all indexes, located on this node

    index_avg_resident_percent     7.2.0gauge

    Average resident percent across all indexes, located on this node

    index_avg_scan_latency     7.0.0gauge / Nanoseconds

    Average latency observed by the index scans, for this index

    index_cache_hits     7.0.0counter

    Number of times the required index page is found in memory, for this index

    index_cache_misses     7.0.0counter

    Number of times the required index page is NOT found in memory, for this index

    index_data_size     7.0.0gauge / bytes

    The approximate size of the valid uncompressed index data, for this index

    index_data_size_on_disk     7.0.0gauge / bytes

    The size of the valid compressed index data, for this index

    index_disk_size     7.0.0gauge / bytes

    Total disk space taken up by this index, after compression. This includes index data files, checkpoints etc.

    index_frag_percent     7.0.0gauge

    Percentage of invalid index data, for this index

    index_heap_in_use     7.6.0gauge / bytes

    Total heap memory in use by indexer process in the node

    index_items_count     7.0.0gauge

    The actual number of items present in the latest index snapshot, for this index

    index_log_space_on_disk     7.0.0gauge / bytes

    The size of the index data files - including garbage, for this index

    index_memory_quota     7.0.0gauge / bytes

    Configured memory quota for the index service nodes

    index_memory_rss     7.2.0gauge / bytes

    Resident set size of the indexer process, running on this node

    index_memory_total_storage     7.2.0gauge / bytes

    Amount of memory used by the index memory allocator, on this node

    index_memory_used     7.0.0gauge / bytes

    The memory used by this index

    index_memory_used_storage     7.2.0gauge / bytes

    Amount of memory used by underlying index storage, on this node

    index_memory_used_total     7.0.0gauge / bytes

    Total memory used by the indexer process

    index_net_avg_scan_rate     7.6.0gauge

    Average index scan rate across all indexes, for this node

    index_num_docs_indexed     7.0.0counter

    Number of document updates (of type insert, modify, delete) observed by this index

    index_num_docs_pending     7.0.0gauge

    Number of pending updates that are yet to be received by index service, for this index

    index_num_docs_queued     7.0.0gauge

    Number of updates queued (but not yet processed) by index service, for this index

    index_num_indexes     7.2.0gauge

    Total number of indexes, located on this node

    index_num_requests     7.0.0counter

    Number of scan requests received by the index service, for this index

    index_num_rows_returned     7.0.0counter

    Number of rows/index entries returned as the scan result during index scans, for this index

    index_num_rows_scanned     7.0.0counter

    Number of rows/index entries read during the index scans, for this index

    index_num_storage_instances     7.2.0gauge

    Total number of storage instances, located on this node

    index_raw_data_size     7.0.0gauge / bytes

    Encoded, uncompressed size of the index data, for this index

    index_recs_in_mem     7.0.0gauge

    Number of index entries cached in memory, for this index

    index_recs_on_disk     7.0.0gauge

    Number of index entries stored on disk, which are not cached in memory, for this index

    index_resident_percent     7.0.0gauge

    Ratio of records in memory to total records, for this index

    index_scan_bytes_read     7.0.0counter / bytes

    Number of bytes read from the index storage during index scans, for this index

    index_storage_avg_item_size     7.6.0gauge / bytes

    Ratio of total item size and total records

    index_storage_bytes_incoming     7.6.0gauge / bytes

    Aggregated total of bytes that are added to the stores and intended to be written on disc

    index_storage_bytes_written     7.6.0gauge / bytes

    Aggregated total of bytes written to the disc(data and recovery)

    index_storage_cleaner_blk_read_bs     7.6.0gauge / bytes

    Total of number bytes read for cleaner log reads (both data and recovery)

    index_storage_cleaner_num_reads     7.6.0gauge

    Total of number of cleaner log reads (both data and recovery)

    index_storage_compression_ratio     7.6.0gauge / bytes

    Ratio of cumulative number of page bytes compressed and cumulative number of page bytes after compression

    index_storage_current_quota     7.6.0gauge / bytes

    Plasma's internally active memory quota for this node. It is tuned by memtuner.

    index_storage_heap_limit     7.6.0gauge / bytes

    Plasma's global heap limit for managed memory for this node

    index_storage_items_count     7.6.0gauge

    Aggregated number of items that are currently in the stores

    index_storage_lookup_blk_reads_bs     7.6.0gauge / bytes

    Total number of bytes that were read from disc into memory for lookups

    index_storage_lookup_num_reads     7.6.0gauge

    Total number of LSS lookups for looking up items from stores

    index_storage_lss_blk_rdr_reads_bs     7.6.0gauge / bytes

    Total number of bytes that were read from disc into memory from the logs(both data and recovery) for index scans

    index_storage_lss_blk_read_bs     7.6.0gauge / bytes

    Total number of bytes that were read from disc into memory from the logs(both data and recovery)

    index_storage_lss_fragmentation     7.6.0gauge

    The fraction of garbage data present in the logs

    index_storage_lss_num_reads     7.6.0gauge

    Total number of times an LSS(both data and recovery) block is read from disk into memory

    index_storage_lss_used_space     7.6.0gauge / bytes

    Total number of bytes used by data and recovery logs

    index_storage_memory_stats_size_page     7.6.0gauge / bytes

    Aggregated number of bytes of memory currently in use by Plasma for page records

    index_storage_num_burst_visits     7.6.0gauge

    Aggregated total of pages visited during burst eviction

    index_storage_num_evictable     7.6.0gauge

    Aggregated total of the number of pages can be compressed

    index_storage_num_evicted     7.6.0gauge

    Aggregated total of the number of pages that were evicted and persisted to disc

    index_storage_num_pages     7.6.0gauge

    Aggregated number of pages that are currently in use

    index_storage_num_periodic_visits     7.6.0gauge

    Aggregated total of pages visited during periodic eviction

    index_storage_purges     7.6.0gauge

    Aggregated number of times various pages are compacted due to the MVCCPurger being triggered

    index_storage_reclaim_pending_global     7.6.0gauge / bytes

    Aggregated number of bytes across all plasma instances which have been freed but not yet returned to OS

    index_storage_resident_ratio     7.6.0gauge

    Ratio of cached records and total records

    index_storage_rlss_num_reads     7.6.0gauge

    Total number of times an LSS block was read into memory due to index scans

    index_total_data_size     7.2.0gauge / bytes

    Sum of data size of all indexes, located on this node

    index_total_disk_size     7.2.0gauge / bytes

    Sum of disk size of all indexes, located on this node

    index_total_drain_rate     7.2.0gauge

    Sum of drain rate of all indexes, located on this node

    index_total_mutation_queue_size     7.6.0gauge

    Total number of index updates queued in the mutation queues, on this node

    index_total_pending_scans     7.6.0gauge

    Sum of number of pending scans across all indexes, located on this node

    index_total_raw_data_size     7.6.0gauge / bytes

    Sum of encoded, uncompressed size of the index data across all indexes, located on this node

    index_total_requests     7.2.0counter

    Sum of number of requests received by all indexes, located on this node

    index_total_rows_returned     7.2.0counter

    Sum of number of rows returned during index scan across all indexes, located on this node

    index_total_rows_scanned     7.2.0counter

    Sum of number of rows scanned during index scans across all indexes, located on this node

    index_total_scan_duration     7.0.0counter / Nanoseconds

    Total time taken by the scans requests, for this index