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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 |
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 |