Monitoring Metrics for OpenSearch Clusters in Cloud Eye

You can use Cloud Eye to monitor cluster metrics of CSS in real time and quickly handle exceptions.

Function

You can use Cloud Eye to monitor cluster metrics of CSS in real time and quickly handle exceptions. This topic describes CSS cluster and node metrics that can be monitored through Cloud Eye, as well as their namespaces and dimensions. You can use the management console or APIs provided by Cloud Eye to check the monitoring metrics and alarms generated for CSS.

Namespace

SYS.ES

Cluster Monitoring Metrics

Table 1 describes the monitoring metrics for CSS clusters.
Monitored objects: CSS clusters. (This document describes the monitoring metrics for Elasticsearch and OpenSearch clusters.) The dimension name is cluster_id.
Monitoring period (original metrics): 1 minute.

Accumulated value: The value is accumulated from when a node is started. After the node is restarted, the value is reset to zero and starts accumulating again.

**Table 1** CSS cluster metrics
Metric ID	Metric	Description	Value Range
status	Cluster Health Status	Health status of the monitored object	0,1,2,3 0: The cluster is 100% available. 1: All primary shards are allocated, but at least one replica is missing. No data is missing, so search results will still be complete. However, high availability is compromised to some degree. If more shards disappear, you might lose data. Think of this status as a warning that should prompt investigation. 2: Data is missing and the cluster fails to work. 3: Failed to obtain the cluster status.
disk_util	Disk Usage	Disk usage of the monitored object. Unit: %	0-100%
max_jvm_heap_usage	Max. JVM Heap Usage	Maximum JVM heap usage of nodes in a CSS cluster. Unit: %	0-100%
max_jvm_young_gc_time	Max. JVM Young GC Duration	Maximum accumulated JVM Young GC duration of nodes in a CSS cluster. Unit: ms	≥ 0 ms
max_jvm_young_gc_count	Max. JVM Young GC Count	Maximum accumulated JVM Young GC count of nodes in a CSS cluster.	≥ 0
max_jvm_old_gc_time	Max. JVM Old GC Duration	Maximum accumulated JVM Old GC duration of nodes in a CSS cluster. Unit: ms	≥ 0 ms
max_jvm_old_gc_count	Max. JVM Old GC Count	Maximum accumulated JVM Old GC count of nodes in a CSS cluster.	≥ 0
total_fs_size	Total Size of File Systems	Total size of file systems in a CSS cluster. Unit: byte	≥ 0 bytes
free_fs_size	Available Size of File Systems	Available size of file systems in a CSS cluster. Unit: byte	≥ 0 bytes
max_cpu_usage	Max. CPU Usage	Maximum node CPU usage in a CSS cluster. Unit: %	0-100%
max_cpu_time_of_jvm_process	Max. CPU Time of JVM Process	Maximum accumulated CPU usage duration of node JVM processes in a CSS cluster. Unit: ms	≥ 0 ms
max_virtual_memory_size_of_jvm_process	Max. Virtual Memory Size of JVM Process	Maximum virtual memory size of node JVM processes in a CSS cluster. Unit: byte	≥ 0 bytes
max_current_opened_http_count	Current Max. Opened HTTP Connections	Maximum number of HTTP connections that are currently open for nodes in a CSS cluster.	≥ 0
max_total_opened_http_count	Total Max. Opened HTTP Connections	Maximum number of HTTP connections that were open for nodes in a CSS cluster.	≥ 0
indices_count	Indexes	Number of indexes in a CSS cluster	≥ 0
total_shards_count	Shards	Number of shards in a CSS cluster	≥ 0
primary_shards_count	Primary Shards	Number of primary shards in a CSS cluster	≥ 0
docs_count	Documents	Number of documents in a CSS cluster	≥ 0
docs_deleted_count	Deleted Documents	Number of documents deleted in a CSS cluster	≥ 0
nodes_count	Nodes	Number of nodes in a CSS cluster	≥ 0
data_nodes_count	Data Nodes	Number of data nodes in a CSS cluster	≥ 0
coordinating_nodes_count	Coordinating Nodes	Number of coordinating nodes in a CSS cluster	≥ 0
master_nodes_count	Master Nodes	Number of master nodes in a CSS cluster	≥ 0
ingest_nodes_count	Client Nodes	Number of client nodes in a CSS cluster	≥ 0
max_load_average	Max. Node Load	Maximum number of average queued tasks per minute on nodes in a cluster	≥ 0
avg_cpu_usage	Avg. CPU Usage	Average node CPU usage in a CSS cluster. Unit: %	0-100%
avg_load_average	Avg. Node Load	Average number of queued tasks per minute on nodes in a CSS cluster	≥ 0
avg_jvm_heap_usage	Avg. JVM Heap Usage	Average node JVM heap usage in a CSS cluster. Unit: %	0-100%
max_open_file_descriptors	Max. Open File Descriptors	Maximum number of node file descriptors that are currently open in a CSS cluster.	≥ 0
avg_open_file_descriptors	Avg. Open File Descriptors	Average number of node file descriptors that are currently open in a CSS cluster.	≥ 0
sum_max_file_descriptors	Max. Allowed File Descriptors	Maximum number of allowed node file descriptors in a CSS cluster.	≥ 0
sum_open_file_descriptors	Open File Descriptors	Number of node file descriptors that are currently open in a cluster.	≥ 0
sum_thread_pool_write_queue	Tasks in Write Queue	Number of tasks in queue for the write thread pool.	≥ 0
sum_thread_pool_search_queue	Tasks in Search Queue	Total number of tasks in queue for the search thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_force_merge_queue	Tasks in ForceMerge Queue	Total number of tasks in queue for the force merge thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_write_rejected	Rejected Tasks in Write Queue	Total number of tasks rejected by the write thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_search_rejected	Rejected Tasks in Search Queue	Total number of tasks rejected by the search thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_force_merge_rejected	Rejected Tasks in ForceMerge Queue	Total number of tasks rejected by the force merge thread pool on nodes in a CSS cluster.	≥ 0
max_thread_pool_search_queue	Max. Tasks in Search Queue	Maximum number of tasks in queue for the search thread pool on nodes in a CSS cluster.	≥ 0
max_thread_pool_force_merge_queue	Max. Tasks in ForceMerge Queue	Maximum number of tasks in queue for the force merge thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_write_threads	Size of Write Thread Pool	Total size of the write thread pools on nodes in the CSS cluster.	≥ 0
sum_thread_pool_search_threads	Size of Search Thread Pool	Total size of the search thread pools on nodes in the CSS cluster.	≥ 0
sum_thread_pool_force_merge_threads	Size of ForceMerge Thread Pool	Total size of the force merge thread pools on nodes in the CSS cluster.	≥ 0
avg_thread_pool_write_queue	Avg. Tasks in Write Queue	Average number of tasks in queue for the write thread pool on nodes in a CSS cluster.	≥ 0
avg_thread_pool_search_queue	Avg. Tasks in Search Queue	Average number of tasks in queue for the search thread pool on nodes in a CSS cluster.	≥ 0
avg_thread_pool_force_merge_queue	Avg. Tasks in ForceMerge Queue	Average number of tasks in queue for the force merge thread pool on nodes in a CSS cluster.	≥ 0
avg_thread_pool_search_threads	Avg. Size of Search Thread Pool	Average size of the search thread pool on nodes in a CSS cluster.	≥ 0
avg_thread_pool_write_threads	Avg. Size of Write Thread Pool	Average size of the write thread pool on nodes in a CSS cluster.	≥ 0
avg_thread_pool_force_merge_threads	Avg. Size of ForceMerge Thread Pool	Average size of the force merge thread pool on nodes in a CSS cluster.	≥ 0
avg_thread_pool_write_rejected	Avg. Rejected Tasks in Write Queue	Average number of tasks rejected by the write thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_flush_queue	Tasks in Flush Queue	Total number of tasks in queue for the flush thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_flush_rejected	Rejected Tasks in Flush Queue	Total number of tasks rejected by the flush thread pool on nodes in a CSS cluster.	≥ 0
max_thread_pool_flush_queue	Max. Tasks in Flush Queue	Maximum number of tasks in queue for the flush thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_flush_threads	Size of Flush Thread Pool	Total size of the flush thread pools on nodes in a CSS cluster.	≥ 0
avg_thread_pool_flush_queue	Avg. Tasks in Flush Queue	Average number of tasks in queue for the flush thread pool on nodes in a CSS cluster.	≥ 0
avg_thread_pool_flush_threads	Avg. Size of Flush Thread Pool	Average number of tasks in queue for the flush thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_generic_queue	Tasks in Generic Queue	Total number of tasks in queue for the generic thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_generic_rejecte	Rejected Tasks in Generic Queue	Total number of tasks rejected by the generic thread pool on nodes in a CSS cluster.	≥ 0
max_thread_pool_generic_queue	Max. Tasks in Generic Queue	Maximum number of tasks in queue for the generic thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_generic_threads	Size of Generic Thread Pool	Total size of the generic thread pools on nodes in a CSS cluster.	≥ 0
avg_thread_pool_generic_queue	Avg. Tasks in Generic Queue	Average number of tasks in queue for the generic thread pool on nodes in a CSS cluster.	≥ 0
avg_thread_pool_generic_threads	Avg. Size of Generic Thread Pool	Average number of tasks in queue for the generic thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_management_queue	Tasks in Management Queue	Total number of tasks in queue for the management thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_management_rejected	Rejected Tasks in Management Queue	Total number of tasks rejected by the management thread pool on nodes in a CSS cluster.	≥ 0
max_thread_pool_management_queue	Max. Tasks in Management Queue	Maximum number of tasks in queue for the management thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_management_threads	Size of Management Thread Pool	Total size of the management thread pools on nodes in a CSS cluster.	≥ 0
avg_thread_pool_management_queue	Avg. Tasks in Management Queue	Average number of tasks in queue for the management thread pool on nodes in a CSS cluster.	≥ 0
avg_thread_pool_management_threads	Avg. Size of Management Thread Pool	Average number of tasks in queue for the management thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_refresh_queue	Tasks in Refresh Queue	Total number of tasks in queue for the refresh thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_refresh_rejected	Rejected Tasks in Refresh Queue	Total number of tasks rejected by the refresh thread pool on nodes in a CSS cluster.	≥ 0
max_thread_pool_refresh_queue	Max. Tasks in Refresh Queue	Maximum number of tasks in queue for the refresh thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_refresh_threads	Size of Refresh Thread Pool	Total size of the refresh thread pools on nodes in a CSS cluster.	≥ 0
avg_thread_pool_refresh_queue	Avg. Tasks in Refresh Queue	Average number of tasks in queue for the refresh thread pool on nodes in a CSS cluster.	≥ 0
avg_thread_pool_refresh_threads	Avg. Size of Refresh Thread Pool	Average number of tasks in queue for the refresh thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_obs_searcher_queue	Tasks in OBS Searcher Queue	Total number of tasks in queue for the OBS Searcher thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_obs_searcher_rejected	Rejected Tasks in OBS Searcher Queue	Total number of tasks rejected by the OBS Searcher thread pool on nodes in a CSS cluster.	≥ 0
max_thread_pool_obs_searcher_queue	Max. Tasks in OBS Searcher Queue	Maximum number of tasks in queue for the OBS Searcher thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_obs_searcher_threads	Size of OBS Searcher Thread Pool	Total size of the OBS Searcher thread pools on nodes in a CSS cluster.	≥ 0
avg_thread_pool_obs_searcher_queue	Avg. Tasks in OBS Searcher Queue	Average number of tasks in queue for the OBS Searcher thread pool on nodes in a CSS cluster.	≥ 0
avg_thread_pool_obs_searcher_threads	Avg. Size of OBS Searcher Thread Pool	Average number of tasks in queue for the OBS Searcher thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_obs_queue	Tasks in OBS Queue	Total number of tasks in queue for the OBS thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_obs_rejected	Rejected Tasks in OBS Queue	Total number of tasks rejected by the OBS thread pool on nodes in a CSS cluster.	≥ 0
max_thread_pool_obs_queue	Max. Tasks in OBS Queue	Maximum number of tasks in queue for the OBS thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_obs_threads	Size of OBS Thread Pool	Total size of the OBS thread pools on nodes in a CSS cluster.	≥ 0
avg_thread_pool_obs_queue	Avg. Tasks in OBS Queue	Average number of tasks in queue for the OBS thread pool on nodes in a CSS cluster.	≥ 0
avg_thread_pool_obs_threads	Avg. Size of OBS Thread Pool	Average number of tasks in queue for the OBS thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_obs_upload_queue	Tasks in OBS Upload Queue	Total number of tasks in queue for the OBS Upload thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_obs_upload_rejected	Rejected Tasks in OBS Upload Queue	Total number of tasks rejected by the OBS Upload thread pool on nodes in a CSS cluster.	≥ 0
max_thread_pool_obs_upload_queue	Max. Tasks in OBS Upload Queue	Maximum number of tasks in queue for the OBS Upload thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_obs_upload_threads	Size of OBS Upload Thread Pool	Total size of the OBS Upload thread pools on nodes in a CSS cluster.	≥ 0
avg_thread_pool_obs_upload_queue	Avg. Tasks in OBS Upload Queue	Average number of tasks in queue for the OBS Upload thread pool on nodes in a CSS cluster.	≥ 0
avg_thread_pool_obs_upload_threads	Avg. Size of OBS Upload Thread Pool	Average number of tasks in queue for the OBS Upload thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_obs_download_queue	Tasks in OBS Download Queue	Total number of tasks in queue for the OBS Download thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_obs_download_rejected	Rejected Tasks in OBS Download Queue	Total number of tasks rejected by the OBS Download thread pool on nodes in a CSS cluster.	≥ 0
max_thread_pool_obs_download_queue	Max. Tasks in OBS Download Queue	Maximum number of tasks in queue for the OBS Download thread pool on nodes in a CSS cluster.	≥ 0
sum_thread_pool_obs_download_threads	Size of OBS Download Thread Pool	Total size of the OBS Download thread pools on nodes in a CSS cluster.	≥ 0
avg_thread_pool_obs_download_queue	Avg. Tasks in OBS Download Queue	Average number of tasks in queue for the OBS Download thread pool on nodes in a CSS cluster.	≥ 0
avg_thread_pool_obs_download_threads	Avg. Size of OBS Download Thread Pool	Average number of tasks in queue for the OBS Download thread pool on nodes in a CSS cluster.	≥ 0
min_free_fs_size	Min. Available Storage Space	Minimum available storage space of nodes in a CSS cluster. Unit: byte	≥ 0 bytes
avg_jvm_old_gc_count	Avg. GCs of Old-Generation JVM	Average number of old-generation garbage collections of nodes in a CSS cluster.	≥ 0
avg_jvm_old_gc_time	Avg. GC Duration of Old-Generation JVM	Average old-generation garbage collection duration of nodes in a CSS cluster. Unit: ms	≥ 0 ms
avg_jvm_young_gc_count	Avg. GCs of Young-Generation JVM	Average number of young-generation garbage collections of nodes in a CSS cluster.	≥ 0
avg_jvm_young_gc_time	Avg. GC Duration of Young-Generation JVM	Average young-generation garbage collection duration of nodes in a CSS cluster. Unit: ms	≥ 0 ms
avg_max_file_descriptors	Avg. Maximum Allowed File Descriptors	Average value of the maximum number of allowed file descriptors on each node in a CSS cluster.	≥ 0
avg_mem_free_in_bytes	Avg. Available Memory	Average unused memory capacity of nodes in a CSS cluster. Unit: byte	≥ 0 bytes
avg_mem_free_percent	Avg. Available Memory Percentage	Average percentage of unused memory of nodes in a CSS cluster. Unit: %	0-100%
avg_mem_used_in_bytes	Avg. Used Memory	Average used memory of nodes in a CSS cluster. Unit: byte	≥ 0 bytes
avg_mem_used_percent	Avg. Used Memory Percentage	Average percentage of used memory of nodes in a CSS cluster. Unit: %	0-100%
max_mem_free_in_bytes	Max. Available Memory	Maximum unused memory of nodes in a CSS cluster. Unit: byte	≥ 0 bytes
max_mem_free_percent	Max. Available Memory Percentage	Maximum percentage of unused memory of nodes in a CSS cluster. Unit: %	0-100%
max_mem_used_in_bytes	Max. Used Memory	Maximum used memory of nodes in a CSS cluster. Unit: byte	≥ 0 bytes
max_mem_used_percent	Max. Used Memory Percentage	Maximum percentage of used memory of nodes in a CSS cluster. Unit: %	0-100%
sum_jvm_old_gc_count	Total GCs of Old-Generation JVM	Number of old-generation garbage collections of nodes in a CSS cluster.	≥ 0
sum_jvm_old_gc_time	Total GC Duration of Old-Generation JVM	Total old-generation garbage collection duration of nodes in the CSS cluster. Unit: ms	≥ 0ms
sum_jvm_young_gc_count	Total GCs of Young-Generation JVM	Number of young-generation garbage collections of nodes in a CSS cluster.	≥ 0
sum_jvm_young_gc_time	Total GC Duration of Young-Generation JVM	Total young-generation garbage collection duration of nodes in the CSS cluster. Unit: ms	≥ 0 ms
sum_current_opened_http_count	Currently Open HTTP Connections	Number of HTTP connections that are open on nodes in a CSS cluster.	≥ 0
sum_total_opened_http_count	Historical Open HTTP Connections	Number of HTTP connections that were open on nodes in a CSS cluster.	≥ 0
IndexingLatency	Average Index Latency	Average time required for a shard to complete an indexing operation. Unit: ms	≥ 0 ms
IndexingRate	Average Index Rate	Average number of index operations per second in a cluster.	≥ 0
SearchLatency	Average Search Latency	Average time required for a shard to complete a search operation. Unit: ms	≥ 0 ms
SearchRate	Average QPS	Average queries per second (QPS) in a cluster.	≥ 0
task_max_running_time	Max. Task Runtime	Duration of the most time-consuming task in the cluster.	≥ 0 ms
number_of_pending_tasks	Number of Pending Tasks in Queue	Number of pending tasks to be processed by the master node in the CSS cluster.	≥ 0
sum_disk_read_requests_rate	Total Disk Read IOPS	Number of disk read requests to all nodes in the CSS cluster per second.	≥ 0
sum_disk_write_requests_rate	Total Disk Write IOPS	Number of disk write requests to all nodes in the CSS cluster per second.	≥ 0
sum_disk_read_bytes_rate	Total Disk Read Rate	Number of bytes of data read from the disks of all nodes in the CSS cluster per second.	≥ 0
sum_disk_write_bytes_rate	Total Disk Write Rate	Number of bytes of data written into the disks of all nodes in the CSS cluster per second.	≥ 0
avg_vector_index_off_heap_used_in_bytes	Average Off-Heap Memory Usage of Vector Indexes	Average off-heap memory (bytes) used for querying vector indexes on each node in a CSS cluster.	≥ 0 bytes
avg_vector_index_off_heap_usage	Average Off-Heap Memory Utilization (%) of Vector Indexes	Average off-heap memory (in %) used for querying vector indexes on each node in a CSS cluster.	0-100%
max_vector_index_off_heap_used_in_bytes	Maximum Off-Heap Memory Usage of Vector Indexes	Maximum off-heap memory (bytes) used for querying vector indexes on each node in a CSS cluster.	≥ 0 bytes
max_vector_index_off_heap_usage	Maximum Off-Heap Memory Utilization (%) of Vector Indexes	Maximum off-heap memory (in %) used for querying vector indexes on each node in a CSS cluster.	0-100%
vector_index_circuit_breaker_status	Vector Index Circuit Breaker Status	Circuit breaker status for vector indexes. 0: Not enabled. 1: Enabled. Check whether the cluster's off-heap memory usage exceeds the threshold.	0, 1
request_count	Total Requests	Total number of requests sent to all nodes in a CSS cluster.	≥ 0
successfully_request_count	Successful requests	Number of requests successfully handled by all nodes in a CSS cluster. Status code: 200.	≥ 0
failed_request_count	Failed requests	Number of failed requests for all nodes in a CSS cluster. Status code: non-200.	≥ 0
limited_request_count	Throttled requests	Number of throttled requests for all nodes in a CSS cluster. Status code: 429.	≥ 0
cold_data_storage	The size of cold data stored	Total size of cold data stored in a CSS cluster.	≥ 0 bytes

Node Monitoring Metrics

Table 2 describes the monitoring metrics for CSS cluster nodes.
Monitored object: Cloud service nodes of CSS clusters. The dimension name is cluster_id,instance_id.
Monitoring period (original metrics): 1 minute

Accumulated value: The value is accumulated from when a node is started. After the node is restarted, the value is reset to zero and starts accumulating again.

**Table 2** CSS node monitoring metrics
Metric ID	Metric	Description	Value Range
jvm_heap_usage	JVM Heap Usage	JVM heap memory usage of a node. Unit: %	0-100%
cpu_usage	CPU Usage	CPU usage. Unit: %	0-100%
disk_util	Disk Usage	Memory usage of a monitored object. Unit: %	0-100%
load_average	Average Load	Average number of queued tasks per minute on a node	≥ 0
open_file_descriptors	Open File Descriptors	Number of opened file descriptors on a node	≥ 0
max_file_descriptors	Max. Allowed File Descriptors	Maximum number of allowed file descriptors	≥ 0
thread_pool_write_queue	Tasks in Write Queue	Number of tasks in queue for the write thread pool.	≥ 0
thread_pool_search_queue	Tasks in Search Queue	Number of tasks in queue for the search thread pool.	≥ 0
thread_pool_force_merge_queue	Tasks in ForceMerge Queue	Number of tasks in queue for the force merge thread pool.	≥ 0
thread_pool_write_rejected	Rejected Tasks in Write Queue	Number of tasks rejected by the write thread pool.	≥ 0
thread_pool_search_rejected	Rejected Tasks in Search Queue	Number of tasks rejected by the search thread pool.	≥ 0
thread_pool_force_merge_rejected	Rejected Tasks in ForceMerge Queue	Number of tasks rejected by the force merge thread pool	≥ 0
thread_pool_write_threads	Size of Write Thread Pool	Size of a write thread pool	≥ 0
thread_pool_search_threads	Size of Search Thread Pool	Size of a search thread pool	≥ 0
thread_pool_force_merge_threads	Size of ForceMerge Thread Pool	Size of a force merge thread pool	≥ 0
thread_pool_flush_queue	Tasks in Flush Queue	Number of tasks in queue for the flush thread pool.	≥ 0
thread_pool_flush_rejected	Rejected Tasks in Flush Queue	Number of tasks rejected by the flush thread pool.	≥ 0
thread_pool_flush_threads	Size of Flush Thread Pool	Size of the flush thread pool.	≥ 0
thread_pool_generic_queue	Tasks in Generic Queue	Number of tasks in queue for the generic thread pool.	≥ 0
thread_pool_generic_rejected	Rejected Tasks in Generic Queue	Number of tasks rejected by the generic thread pool.	≥ 0
thread_pool_generic_threads	Size of Generic Thread Pool	Size of the generic thread pool.	≥ 0
thread_pool_management_queue	Tasks in Management Queue	Number of tasks in queue for the management thread pool.	≥ 0
thread_pool_management_rejected	Rejected Tasks in Management Queue	Number of tasks rejected by the management thread pool.	≥ 0
thread_pool_management_threads	Size of Management Thread Pool	Size of the management thread pool.	≥ 0
thread_pool_refresh_queue	Tasks in Refresh Queue	Number of tasks in queue for the refresh thread pool.	≥ 0
thread_pool_refresh_rejected	Rejected Tasks in Refresh Queue	Number of tasks rejected by the refresh thread pool.	≥ 0
thread_pool_refresh_threads	Size of Refresh Thread Pool	Size of the refresh thread pool.	≥ 0
thread_pool_obs_searcher_queue	Tasks in OBS Searcher Queue	Number of tasks in queue for the OBS Searcher thread pool.	≥ 0
thread_pool_obs_searcher_rejected	Rejected Tasks in OBS Searcher Queue	Number of tasks rejected by the OBS Searcher thread pool.	≥ 0
thread_pool_obs_searcher_threads	Size of OBS Searcher Thread Pool	Size of the OBS Searcher thread pool.	≥ 0
thread_pool_obs_queue	Tasks in OBS Queue	Number of tasks in queue for the OBS thread pool.	≥ 0
thread_pool_obs_rejected	Rejected Tasks in OBS Queue	Number of tasks rejected by the OBS thread pool.	≥ 0
thread_pool_obs_threads	Size of OBS Thread Pool	Size of the OBS thread pool.	≥ 0
thread_pool_obs_upload_queue	Tasks in OBS Upload Queue	Number of tasks in queue for the OBS Upload thread pool.	≥ 0
thread_pool_obs_upload_rejected	Rejected Tasks in OBS Upload Queue	Number of tasks rejected by the OBS Upload thread pool.	≥ 0
thread_pool_obs_upload_threads	Size of OBS Upload Thread Pool	Size of the OBS Upload thread pool.	≥ 0
thread_pool_obs_download_queue	Tasks in OBS Download Queue	Number of tasks in queue for the OBS Download thread pool.	≥ 0
thread_pool_obs_download_rejected	Rejected Tasks in OBS Download Queue	Number of tasks rejected by the OBS Upload thread pool.	≥ 0
thread_pool_obs_download_threads	Size of OBS Download Thread Pool	Size of the OBS Download thread pool.	≥ 0
free_fs_size	Available Size of File Systems	Available size of file systems in a CSS cluster. Unit: byte	≥ 0 bytes
total_fs_size	Total Size of File Systems	Total size of file systems in a CSS cluster. Unit: byte	≥ 0 bytes
jvm_old_gc_count	Total GCs of Old-Generation JVM	Number of old-generation garbage collection times	≥ 0
jvm_old_gc_time	Total GC Duration of Old-Generation JVM	Time spent on old-generation garbage collection Unit: ms	≥ 0 ms
jvm_young_gc_count	Total GCs of Young-Generation JVM	Number of young-generation garbage collection times	≥ 0
jvm_young_gc_time	GC Duration of Young-Generation JVM	Time spent on young-generation garbage collection Unit: ms	≥ 0 ms
mem_free_in_bytes	Available Memory	Unused memory space of a node. Unit: byte	≥ 0 bytes
mem_free_percent	Available Memory Percentage	Percentage of unused memory space on a node.	≥ 0
mem_used_in_bytes	Used Memory	Used memory space of a node. Unit: byte	≥ 0 bytes
current_opened_http_count	Currently Open HTTP Connections	Number of HTTP connections currently open on a node	≥ 0
total_opened_http_count	Total Open HTTP Connections	Total number of HTTP connections on a node	≥ 0
disk_read_requests_rate	Disk Read IOPS	Number of disk read requests to a node in the CSS cluster per second.	≥ 0
disk_write_requests_rate	Disk Write IOPS	Number of disk write requests to a node in the CSS cluster per second.	≥ 0
disk_read_bytes_rate	Disk Read Rate	Number of bytes of data read from the disks of a node in the CSS cluster per second.	≥ 0
disk_write_bytes_rate	Disk Write Rate	Number of bytes of data written into the disks of a node in the CSS cluster per second.	≥ 0
shards_count	Shards	Number of shards on a node in the CSS cluster.	≥ 0
vector_index_off_heap_used_in_bytes	Off-Heap Memory Usage of Vector Indexes	Off-heap memory (bytes) used for querying vector indexes on nodes in a CSS cluster.	≥ 0 bytes
vector_index_off_heap_usage	Off-Heap Memory Utilization (%) of Vector Indexes	Off-heap memory (in %) used for querying vector indexes on nodes in a CSS cluster.	0-100%