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ScyllaDB Enterprise Metric Update - ScyllaDB Enterprise 2022.x to 2023.1¶

ScyllaDB Enterprise 2023.1 Dashboards are available as part of the latest Scylla Monitoring Stack.

Renamed Metrics¶

The following metrics are renamed in ScyllaDB Enterprise 2023.1:

2022.x	2023.1
scylla_memory_regular_virtual_dirty_bytes	scylla_memory_regular_unspooled_dirty_bytes
scylla_memory_system_virtual_dirty_bytes	scylla_memory_system_unspooled_dirty_bytes
scylla_memory_virtual_dirty_bytes	scylla_memory_unspooled_dirty_bytes

New Metrics¶

The following metrics are new in ScyllaDB Enterprise 2023.1 compared to 2022.2:

Metric	Description
scylla_database_disk_reads	Holds the number of currently active disk read operations.
scylla_database_reads_memory_consumption	Holds the amount of memory consumed by current read operations issued on behalf of streaming
scylla_database_sstables_read	Holds the number of currently read sstables.
scylla_memory_malloc_failed	Total count of failed memory allocations
scylla_raft_add_entries	How many entries were added on this node
scylla_raft_applied_entries	How many log entries were applied
scylla_raft_group0_status	Status of the raft group: 0 - disabled, 1 - normal, 2 - aborted
scylla_raft_in_memory_log_size	Size of in-memory part of the log
scylla_raft_log_memory_usage	Memory usage of in-memory part of the log in bytes
scylla_raft_messages_received	How many messages were received
scylla_raft_messages_sent	How many messages were send
scylla_raft_persisted_log_entries	How many log entries were persisted
scylla_raft_polls	How many time raft state machine was polled
scylla_raft_queue_entries_for_apply	How many log entries were queued to be applied
scylla_raft_sm_load_snapshot	How many times user state machine was reloaded with a snapshot
scylla_raft_snapshots_taken	How many time the user’s state machine was snapshotted
scylla_raft_store_snapshot	How many snapshot were persisted
scylla_raft_store_term_and_vote	How many times term and vote were persisted
scylla_raft_truncate_persisted_log	How many times log was truncated on storage
scylla_raft_waiter_awoken	How many waiters got result back
scylla_raft_waiter_dropped	How many waiters did not get result back
scylla_storage_proxy_coordinator_read_latency_summary	Read latency summary
scylla_storage_proxy_coordinator_write_latency_summary	Write latency summary
scylla_streaming_finished_percentage	Finished percentage of node operation on this shard
scylla_view_update_generator_sstables_pending_work	Number of bytes remaining to be processed from SSTables for view updates

The following metrics are new in ScyllaDB Enterprise 2023.1 compared to 2022.1:

Metric	Description
scylla_alien_receive_batch_queue_length	Current receive batch queue length
scylla_cache_rows_compacted_with_tombstones	Number of rows scanned during write of a tombstone for the purpose of compaction in cache
scylla_cache_rows_dropped_by_tombstones	Number of rows dropped in cache by a tombstone write
scylla_commitlog_active_allocations	Current number of active allocations.
scylla_commitlog_blocked_on_new_segment	Number of allocations blocked on acquiring new segment.
scylla_commitlog_bytes_flush_requested	Counts number of bytes requested to be flushed (persisted).
scylla_commitlog_bytes_released	Counts number of bytes released from disk. (Deleted/recycled)
scylla_compaction_manager_completed_compactions	Holds the number of completed compaction tasks.
scylla_compaction_manager_failed_compactions	Holds the number of failed compaction tasks.
scylla_compaction_manager_normalized_backlog	Holds the sum of normalized compaction backlog for all tables in the system. Backlog is normalized by dividing backlog by shard’s available memory.
scylla_compaction_manager_postponed_compactions	Holds the number of tables with postponed compaction.
scylla_compaction_manager_validation_errors	Holds the number of encountered validation errors.
scylla_cql_select_parallelized	Counts the number of parallelized aggregation SELECT query executions.
scylla_database_disk_reads	Holds the number of currently active disk read operations.
scylla_database_reads_memory_consumption	Holds the amount of memory consumed by current read operations issued on behalf of streaming
scylla_database_sstables_read	Holds the number of currently read sstables.
scylla_database_total_reads_rate_limited	Counts read operations which were rejected on the replica side because the per-partition limit was reached.
scylla_database_total_writes_rate_limited	Counts write operations which were rejected on the replica side because the per-partition limit was reached.
scylla_forward_service_requests_dispatched_to_other_nodes	How many forward requests were dispatched to other nodes
scylla_forward_service_requests_dispatched_to_own_shards	How many forward requests were dispatched to local shards
scylla_forward_service_requests_executed	How many forward requests were executed
scylla_gossip_live	How many live nodes the current node sees
scylla_gossip_unreachable	How many 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_memory_malloc_failed	Total count of failed memory allocations
scylla_per_partition_rate_limiter_allocations	Number of times a 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_raft_add_entries	How many entries were added on this node
scylla_raft_applied_entries	How many log entries were applied
scylla_raft_group0_status	Status of the raft group: 0 - disabled, 1 - normal, 2 - aborted
scylla_raft_in_memory_log_size	Size of in-memory part of the log
scylla_raft_log_memory_usage	Memory usage of in-memory part of the log in bytes
scylla_raft_messages_received	How many messages were received
scylla_raft_messages_sent	How many messages were send
scylla_raft_persisted_log_entries	How many log entries were persisted
scylla_raft_polls	How many time raft state machine was polled
scylla_raft_queue_entries_for_apply	How many log entries were queued to be applied
scylla_raft_sm_load_snapshot	How many times user state machine was reloaded with a snapshot
scylla_raft_snapshots_taken	How many time the user’s state machine was snapshotted
scylla_raft_store_snapshot	How many snapshot were persisted
scylla_raft_store_term_and_vote	How many times term and vote were persisted
scylla_raft_truncate_persisted_log	How many times log was truncated on storage
scylla_raft_waiter_awoken	How many waiters got result back
scylla_raft_waiter_dropped	How many waiters did not get result back
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_allocating_segments	Holds the number of not closed segments that still have some free space. This value should not get too high.
scylla_schema_commitlog_alloc	Counts 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 new segment.
scylla_schema_commitlog_bytes_flush_requested	Counts number of bytes requested to be flushed (persisted).
scylla_schema_commitlog_bytes_released	Counts number of bytes released from disk. (Deleted/recycled)
scylla_schema_commitlog_bytes_written	Counts number of bytes written to the disk. Divide this value by “alloc” to get the average number of bytes per mutation written to the disk.
scylla_schema_commitlog_cycle	Counts number of commitlog write cycles - when the data is written from the internal memory buffer to the disk.
scylla_schema_commitlog_disk_active_bytes	Holds size of disk space in bytes used for data so far. A too high value indicates that we have some bottleneck in the writing to sstables path.
scylla_schema_commitlog_disk_slack_end_bytes	Holds size of disk space in bytes unused because of segment switching (end slack). A too high value indicates that we do not write enough data to each segment.
scylla_schema_commitlog_disk_total_bytes	Holds size of disk space in bytes reserved for data so far. A too high value indicates that we have some bottleneck in the writing to sstables path.
scylla_schema_commitlog_flush	Counts number of times the flush() method was called for a file.
scylla_schema_commitlog_flush_limit_exceeded	Counts 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	Holds the total number of bytes in internal memory buffers.
scylla_schema_commitlog_pending_allocations	Holds number of currently pending allocations. A non-zero value indicates that we have a bottleneck in the disk write flow.
scylla_schema_commitlog_pending_flushes	Holds number of currently pending flushes. See the related flush_limit_exceeded metric.
scylla_schema_commitlog_requests_blocked_memory	Counts 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	Holds the current number of segments.
scylla_schema_commitlog_slack	Counts number of unused bytes written to the disk due to disk segment alignment.
scylla_schema_commitlog_unused_segments	Holds the current number of unused segments. A non-zero value indicates that the disk write path became temporary slow.
scylla_sstables_pi_auto_scale_events	Number of promoted index auto-scaling events
scylla_storage_proxy_coordinator_read_latency_summary	Read latency summary
scylla_storage_proxy_coordinator_write_latency_summary	Write latency summary
scylla_streaming_finished_percentage	Finished percentage of node operation on this shard
scylla_view_update_generator_sstables_pending_work	Number of bytes remaining to be processed from SSTables for view updates

Reporting Latencies¶

ScyllaDB Enterprise 2023.1 comes with a new approach to reporting latencies, which are reported using histograms and summaries:

Histograms are reported per node.
Summaries are reported per shard and contain P50, P95, and P99 latency.

For more information on Prometheus histograms and summaries, see the Prometheus documentation.

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