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Scylla Metric Update - Scylla 5.0 to 5.1¶

Scylla 5.1 Dashboards are available as part of the latest Scylla Monitoring Stack.

The following metrics are new in Scylla 5.1¶

Metric	Description
scylla_cache_rows_compacted_with_tombstones	Number of rows dropped in the cache by a tombstone write
scylla_cache_rows_dropped_by_tombstones	Total number of rows in memtables that were dropped during a cache update on memtable flush
scylla_commitlog_active_allocations	Current number of active allocations
scylla_commitlog_blocked_on_new_segment	Number of allocations blocked on acquiring a new segment
scylla_commitlog_bytes_flush_requested	Number of bytes requested to be flushed (persisted)
scylla_commitlog_bytes_released	Number of bytes released from disk (deleted/recycled
scylla_compaction_manager_completed_compactions	Number of completed compaction tasks
scylla_compaction_manager_failed_compactions	Number of failed compaction tasks
scylla_compaction_manager_normalized_backlog	Sum of normalized compaction backlog for all tables in the system. Backlog is normalized by dividing backlog by the shard’s available memory.
scylla_compaction_manager_postponed_compactions	Number of tables with postponed compaction
scylla_compaction_manager_validation_errors	Number of encountered validation errors
scylla_cql_select_parallelized	Number of parallelized aggregation SELECT query executions
scylla_database_total_reads_rate_limited	Number of read operations that were rejected on the replica side because the per-partition limit was reached
scylla_database_total_writes_rate_limited	Number of write operations that were rejected on the replica side because the per-partition limit was reached
scylla_forward_service_requests_dispatched_to_other_nodes	Number of forward requests that were dispatched to other nodes
scylla_forward_service_requests_dispatched_to_own_shards	Number of forward requests that were dispatched to local shards
scylla_forward_service_requests_executed	Number of forward requests that were executed
scylla_gossip_live	Number of live nodes the current node sees
scylla_gossip_unreachable	Number of unreachable nodes the current node sees
scylla_io_queue_adjusted_consumption	Consumed disk capacity units adjusted for class shares and idling preemption
scylla_io_queue_consumption	Accumulated disk capacity units consumed by this class; an increment per-second rate indicates full utilization
scylla_io_queue_total_split_bytes	Total number of bytes split
scylla_io_queue_total_split_ops	Total number of requests split
scylla_per_partition_rate_limiter_allocations	Number of times an entry was allocated over an empty/expired entry
scylla_per_partition_rate_limiter_failed_allocations	Number of times the rate limiter gave up trying to allocate
scylla_per_partition_rate_limiter_load_factor	Current load factor of the hash table (upper bound, may be overestimated)
scylla_per_partition_rate_limiter_probe_count	Number of probes made during lookups
scylla_per_partition_rate_limiter_successful_lookups	Number of times a lookup returned an already allocated entry
scylla_reactor_aio_outsizes	Total number of AIO operations that exceed IO limit
scylla_schema_commitlog_active_allocations	Current number of active allocations
scylla_schema_commitlog_alloc	Number of not closed segments that still have some free space. This value should not get too high.
scylla_schema_commitlog_allocating_segments	Number of times a new mutation has been added to a segment. Divide bytes_written by this value to get the average number of bytes per mutation written to the disk.
scylla_schema_commitlog_blocked_on_new_segment	Number of allocations blocked on acquiring a new segment
scylla_schema_commitlog_bytes_flush_requested	Number of bytes requested to be flushed (persisted)
scylla_schema_commitlog_bytes_released	Number of bytes released from disk (deleted/recycled)
scylla_schema_commitlog_bytes_written	Number of bytes written to disk. Divide this value by “alloc” to get the average number of bytes per mutation written to the disk.
scylla_schema_commitlog_cycle	Number of commitlog write cycles - when the data is written from the internal memory buffer to the disk
scylla_schema_commitlog_disk_active_bytes	Size of disk space in bytes used for data so far. A too high value indicates that there is a bottleneck in writing to SStable paths.
scylla_schema_commitlog_disk_slack_end_bytes	Size of disk space (in bytes) unused because of segment switching (end slack). A too high value indicates that not enough data is written to each segment.
scylla_schema_commitlog_disk_total_bytes	Size of disk space (in bytes) reserved for data so far. A too high value indicates that there is a bottleneck in writing to SStable paths.
scylla_schema_commitlog_flush	Number of times the flush() method was called for a file
scylla_schema_commitlog_flush_limit_exceeded	Number of times a flush limit was exceeded. A non-zero value indicates that there are too many pending flush operations (see pending_flushes), and some of them will be blocked till the total amount of pending flush operations drops below 5.
scylla_schema_commitlog_memory_buffer_bytes	Total number of bytes in internal memory buffers
scylla_schema_commitlog_pending_allocations	Number of currently pending allocations. A non-zero value indicates that there is a bottleneck in the disk write flow.
scylla_schema_commitlog_pending_flushes	Number of currently pending flushes. See the related `flush_limit_exceeded` metric.
scylla_schema_commitlog_requests_blocked_memory	Number of requests blocked due to memory pressure. A non-zero value indicates that the commitlog memory quota is not enough to serve the required amount of requests.
scylla_schema_commitlog_segments	Current number of segments
scylla_schema_commitlog_slack	Number of unused bytes written to the disk due to disk segment alignment
scylla_schema_commitlog_unused_segments	Current number of unused segments. A non-zero value indicates that the disk write path became temporarily slow.
scylla_sstables_pi_auto_scale_events	Number of promoted index auto-scaling events
scylla_storage_proxy_coordinator_read_rate_limited	Number of read requests that were rejected by replicas because the rate limit for the partition was reached
scylla_storage_proxy_coordinator_write_rate_limited	Number of write requests that were rejected by replicas because the rate limit for the partition was reached

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