ScyllaDB Enterprise Metric Update - ScyllaDB Enterprise 2021.1 to 2022.1

ScyllaDB Enterprise Metric Update - ScyllaDB Enterprise 2021.1 to 2022.1¶

New Metrics¶

The following metrics were added in ScyllaDB 2022.1:

Metric	Description
scylla_commitlog_disk_slack_end_bytes	Holds a 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_cql_authorized_prepared_statements_unprivileged_entries_evictions_on_size	Counts a number of evictions of prepared statements from the authorized prepared statements cache after they have been used only once. An increasing counter suggests the user may be preparing a different statement for each request instead of reusing the same prepared statement with parameters.
scylla_cql_unprivileged_entries_evictions_on_size	Counts a number of evictions of prepared statements from the prepared statements cache after they have been used only once. An increasing counter suggests the user may be preparing a different statement for each request instead of reusing the same prepared statement with parameters.
scylla_database_reads_shed_due_to_overload	The number of reads shed because the admission queue reached its max capacity. When the queue is full, excessive reads are shed to avoid overload.
scylla_database_sstable_read_queue_overloads	Counts the number of times the sstable read queue was overloaded. A non-zero value indicates that we have to drop read requests because they arrive faster than we can serve them.
scylla_io_queue_disk_queue_length	Number of requests in the disk.
scylla_io_queue_starvation_time_sec	Total time spent starving for disk.
scylla_io_queue_total_delay_sec	Total time spent in the queue.
scylla_io_queue_total_exec_sec	Total time spent in disk.
scylla_io_queue_total_read_bytes	Total read bytes passed in the queue.
scylla_io_queue_total_read_ops	Total read operations passed in the queue.
scylla_io_queue_total_write_bytes	Total write bytes passed in the queue.
scylla_io_queue_total_write_ops	Total write operations passed in the queue.
scylla_node_ops_finished_percentage	Finished percentage of node operation on this shard.
scylla_scheduler_starvetime_ms	Accumulated starvation time of this task queue; an increment rate of 1000ms per second indicates the scheduler feels really bad.
scylla_scheduler_waittime_ms	Accumulated waittime of this task queue; an increment rate of 1000ms per second indicates queue is waiting for something (e.g. IO).
scylla_sstables_index_page_cache_bytes_in_std	Total number of bytes in temporary buffers which live in the std allocator.
scylla_sstables_index_page_evictions	Index pages which got evicted from memory.
scylla_sstables_index_page_populations	Index pages which got populated into memory.
scylla_sstables_index_page_used_bytes	Amount of bytes used by index pages in memory.
scylla_storage_proxy_coordinator_total_write_attempts_remote_node	Total number of write requests when communicating with external Nodes in DC datacenter1.
scylla_storage_proxy_coordinator_writes_failed_due_to_too_many_in_flight_hints	Number of CQL write requests which failed because the hinted handoff mechanism is overloaded and cannot store any more in-flight hints.
scylla_transport_auth_responses	Counts the total number of received CQL AUTH messages.
scylla_transport_batch_requests	Counts the total number of received CQL BATCH messages.
scylla_transport_cql_errors_total	Counts the total number of returned CQL errors.
scylla_transport_execute_requests	Counts the total number of received CQL EXECUTE messages.
scylla_transport_options_requests	Counts the total number of received CQL OPTIONS messages.
scylla_transport_prepare_requests	Counts the total number of received CQL PREPARE messages.
scylla_transport_query_requests	Counts the total number of received CQL QUERY messages.
scylla_transport_register_requests	Counts the total number of received CQL REGISTER messages.
scylla_transport_startups	Counts the total number of received CQL STARTUP messages.

Removed Metrics¶

The following metrics are no longer available in ScyllaDB 2022.1:

scylla_memory_streaming_dirty_bytes
scylla_memory_streaming_virtual_dirty_bytes
querier_cache_memory_based_evictions

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