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Metrics Update Between 2026.1 and 2026.2¶

ScyllaDB 2026.2 Dashboards are available as part of the latest Scylla Monitoring Stack.

New Metrics in 2026.2¶

The following metrics are new in ScyllaDB 2026.2 compared to 2026.1.

Metric	Description
scylla_auth_cache_permissions	Total number of permission sets currently cached across all roles.
scylla_auth_cache_roles	Number of roles currently cached.
scylla_cql_forwarded_requests	Counts the total number of attempts to forward CQL requests to other nodes. One request may be forwarded multiple times, particularly when a write is handled by a non-replica node.
scylla_cql_write_consistency_levels_disallowed_violations	Counts the number of write_consistency_levels_disallowed guardrail violations, i.e. attempts to write with a forbidden consistency level.
scylla_cql_write_consistency_levels_warned_violations	Counts the number of write_consistency_levels_warned guardrail violations, i.e. attempts to write with a discouraged consistency level.
scylla_cql_writes_per_consistency_level	Counts the number of writes for each consistency level.
scylla_io_queue_integrated_disk_queue_length	Length of the integrated disk queue.
scylla_io_queue_integrated_queue_length	Length of the integrated queue.
scylla_logstor_sm_bytes_freed	Counts the number of data bytes freed.
scylla_logstor_sm_bytes_read	Counts the number of bytes read from the disk.
scylla_logstor_sm_bytes_written	Counts the number of bytes written to the disk.
scylla_logstor_sm_compaction_bytes_written	Counts the number of bytes written to the disk by compaction.
scylla_logstor_sm_compaction_data_bytes_written	Counts the number of data bytes written to the disk by compaction.
scylla_logstor_sm_compaction_records_rewritten	Counts the number of records rewritten during compaction.
scylla_logstor_sm_compaction_records_skipped	Counts the number of records skipped during compaction.
scylla_logstor_sm_compaction_segments_freed	Counts the number of data bytes written to the disk.
scylla_logstor_sm_disk_usage	Total disk usage.
scylla_logstor_sm_free_segments	Counts the number of free segments currently available.
scylla_logstor_sm_segment_pool_compaction_segments_get	Counts the number of segments taken from the segment pool for compaction.
scylla_logstor_sm_segment_pool_normal_segments_get	Counts the number of segments taken from the segment pool for normal writes.
scylla_logstor_sm_segment_pool_normal_segments_wait	Counts the number of times normal writes had to wait for a segment to become available in the segment pool.
scylla_logstor_sm_segment_pool_segments_put	Counts the number of segments returned to the segment pool.
scylla_logstor_sm_segment_pool_separator_segments_get	Counts the number of segments taken from the segment pool for separator writes.
scylla_logstor_sm_segment_pool_size	Counts the number of segments in the segment pool.
scylla_logstor_sm_segments_allocated	Counts the number of segments allocated.
scylla_logstor_sm_segments_compacted	Counts the number of segments compacted.
scylla_logstor_sm_segments_freed	Counts the number of segments freed.
scylla_logstor_sm_segments_in_use	Counts the number of segments currently in use.
scylla_logstor_sm_separator_buffer_flushed	Counts the number of times the separator buffer has been flushed.
scylla_logstor_sm_separator_bytes_written	Counts the number of bytes written to the separator.
scylla_logstor_sm_separator_data_bytes_written	Counts the number of data bytes written to the separator.
scylla_logstor_sm_separator_flow_control_delay	Current delay applied to writes to control separator debt in microseconds.
scylla_logstor_sm_separator_segments_freed	Counts the number of segments freed by the separator.
scylla_transport_cql_pending_response_memory	Holds the total memory in bytes consumed by responses waiting to be sent.
scylla_transport_cql_request_histogram_bytes	A histogram of received bytes in CQL messages of a specific kind and specific scheduling group.
scylla_transport_cql_requests_serving	Holds the number of requests that are being processed right now.
scylla_transport_cql_response_histogram_bytes	A histogram of received bytes in CQL messages of a specific kind and specific scheduling group.
scylla_transport_requests_forwarded_failed	Counts the number of requests that were forwarded to another replica but failed to execute there.
scylla_transport_requests_forwarded_prepared_not_found	Counts the number of requests that were forwarded to another replica but failed there because the statement was not prepared on the target. When this happens, the coordinator performs an additional remote call to prepare the statement on the replica and retries the EXECUTE request afterwards.
scylla_transport_requests_forwarded_redirected	Counts the number of requests that were forwarded to another replica but that replica responded with a redirect to another node. This can happen when replica has stale information about the cluster topology or when the request is handled by a node that is not a replica for the data being accessed by the request.
scylla_transport_requests_forwarded_successfully	Counts the number of requests that were forwarded to another replica and executed successfully there.

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