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ServiceWatch metric

The Search Engine sends metrics to ServiceWatch. The metrics provided by default monitoring are data collected at 1‑minute intervals.

Reference

Refer to the ServiceWatch guide for how to view metrics in ServiceWatch.

Basic Metrics

The following are the basic metrics for the Search Engine namespace.

The indicators whose names are displayed in bold below are the indicators selected as key metrics among the basic metrics provided by Search Engine. The key metrics are used to build service dashboards that are automatically created for each service in ServiceWatch.

Each metric provides guidance in the user guide on which statistical values are meaningful when viewing that metric, and among the meaningful statistics, the values shown in bold are the primary statistics. In the service dashboard, you can view key metrics through primary statistical values.

OS Basic Metrics

Category	Performance items	unit	Detailed description	meaningful statistics
CPU	CPU Usage	Percent	CPU usage	Total Average Maximum Minimum
Disk	Disk Usage	Percent	Disk usage	Total Average Maximum Minimum
Disk	Disk Write Bytes	Bytes/Second	Write throughput on block device (bytes/second)	Total Average Maximum Minimum
Disk	Disk Read Bytes	Bytes/Second	Read throughput from block device (bytes/second)	Total Average Maximum Minimum
Disk	Disk Write Requests	Count/Second	Number of write requests on block device (requests per second)	Total Average Maximum Minimum
Disk	Disk Read Requests	Count/Second	Number of read requests on block device (requests per second)	Total Average Maximum Minimum
Disk	Average Disk I/O Queue Size	None	Average queue length of requests issued to the block device	Total Average Maximum Minimum
Disk	Disk I/O Utilization	Percent	The proportion of time the block device actually spent handling I/O operations	Total Average Maximum Minimum
Memory	Memory Usage	Percent	Memory usage	Total Average Maximum Minimum
Memory	Swap Out Bytes	Bytes/Second	Data transferred from memory to swap area (bytes/second)	Total Average Maximum Minimum
Memory	Swap Used Bytes	Bytes	Current swap space size	Total Average Maximum Minimum
Memory	Swap Cached Usage	Percent	Cached swap usage rate	Total Average Maximum Minimum
Memory	Swap Total Bytes	Bytes	Total swap space size configured on the system	Total Average Maximum Minimum
Memory	Swap In Bytes	Bytes/Second	Amount read from swap area to memory (bytes/second)	Total Average Maximum Minimum
Memory	Swap Usage	Percent	Current usage ratio relative to total swap space	Total Average Maximum Minimum
Memory	Swap Cached Bytes	Bytes	Size of pages that have been restored to memory but still have a copy in the swap area	Total Average Maximum Minimum
Memory	Swap Free Bytes	Bytes	Size of unused remaining swap space	Total Average Maximum Minimum
Network	Network In Bytes	Bytes/Second	Received capacity (bytes/second) on the network interface	Total Average Maximum Minimum
Network	Network Out Bytes	Bytes/Second	Transmitted capacity (bytes/second) on the network interface	Total Average Maximum Minimum
Network	TCP Connections	Count/Second	Total number of TCP connections currently properly established	Total Average Maximum Minimum
Network	Network In Packets	Count	Number of packets received on the network interface	Total Average Maximum Minimum
Network	Network Out Packets	Count	Number of packets transmitted on the network interface	Total Average Maximum Minimum
Network	Network In Dropped	Count	Number of packet drops received on the network interface	Total Average Maximum Minimum
Network	Network Out Dropped	Count	Number of packet drops transmitted from the network interface	Total Average Maximum Minimum
Network	Network In Errors	Count	Number of packet errors received on the network interface	Total Average Maximum Minimum
Network	Network Out Errors	Count	Number of packet errors transmitted from the network interface	Total Average Maximum Minimum
OS	OS Uptime	Seconds	The time elapsed (seconds) since the system was last booted.	Total Average Maximum Minimum

Table. OS basic metrics

Search Engine basic metrics

Category	Performance items	unit	Detailed description	meaningful statistics
cache	Field data evictions	Count/Second	Number of items forcibly removed (evicted) from the field data cache due to memory pressure	Total Average Maximum Minimum
cache	Field data memory size	Bytes	Displays the amount of memory, in bytes, that the node occupies in the field data cache Field data is used for sorting, aggregation, script execution, etc., and the more cached data there is, the higher the memory usage	Total Average Maximum Minimum
cache	Query cache evictions	Count/Second	Number of cache entries automatically deleted (evicted) from the query cache due to memory shortage, etc.	Total Average Maximum Minimum
cache	Query cache size	Bytes	Display the amount of memory the node occupies in the query cache in bytes	Total Average Maximum Minimum
Cluster Status	Cluster health	None	Indicates whether all primary and replica shards are allocated Color: green If the value for Color: green is 1, it means that all index shards in the cluster are allocated to nodes Color: yellow If the value for Color: yellow is 1, it means that the primary shards of all indices are allocated to nodes, but at least one index has its replica shards unallocated Color: red If the value for Color: red is 1, it means that for one or more indices, both primary and replica shards are not allocated to nodes	Total Average Maximum Minimum
cpu	SearchEngine CPU usage	Percent	Display the current CPU usage of the Search Engine process as a percentage (%)	Total Average Maximum Minimum
document	SearchableDocuments	Count	Total number of searchable documents held by the node (primary + replica)	Total Average Maximum Minimum
document	DeletedDocuments	Count	Total number of documents marked for deletion (soft delete) on the node (primary + replica)	Total Average Maximum Minimum
filesystem	Data Filesystem Available	Bytes	Current available capacity (Byte) in the file system storing Search Engine data	Total Average Maximum Minimum
filesystem	Data Filesystem Size	Bytes	Total capacity (Byte) of the file system that stores Search Engine data	Total Average Maximum Minimum
Indexing	Documents deleted rate	Count/Second	Number of documents deleted by the node	Total Average Maximum Minimum
Indexing	Indexing Time	None	Time (seconds) the node spent on indexing	Total Average Maximum Minimum
Indexing	Documents indexed rate	Count/Second	Number of documents indexed (added/updated) by the node	Total Average Maximum Minimum
jvm	Count in GC	Count/Second	Number of times JVM garbage collection was executed	Total Average Maximum Minimum
jvm	Time spent in GC	None	Time spent on JVM garbage collection (GC time in seconds per minute)	Total Average Maximum Minimum
jvm	JVM Memory Max	Bytes	JVM max memory setting value	Total Average Maximum Minimum
jvm	JVM Memory Used	Bytes	Amount of memory used by the JVM	Total Average Maximum Minimum
Merges	Documents merged rate	Count/Second	Number of documents processed during the merge process	Total Average Maximum Minimum
Merges	Documents merged bytes	Bytes/Second	Total bytes processed in the merge process	Total Average Maximum Minimum
Merges	Merging time	None	Node’s time spent on merge operation (seconds) merging (elapsed seconds/Second)	Total Average Maximum Minimum
network	Node-to-Node Network In Bytes	Bytes/Second	Number of bytes received in communication between Search Engine nodes	Total Average Maximum Minimum
network	Node-to-Node Network Out Bytes	Bytes/Second	Number of bytes transmitted in communication between Search Engine nodes	Total Average Maximum Minimum
nodes	Nodes	Count	Total number of nodes	Total Average Maximum Minimum
Search	Query time	None	Node time spent executing the search query (seconds) query (elapsed seconds/Second)	Total Average Maximum Minimum
SearchEngineDashboards	SearchEngineDashboards Connections	Count	SearchEngineDashboards concurrent connection count	Total Average Maximum Minimum
SearchEngineDashboards	SearchEngineDashboards Memory Total	Bytes	Memory amount secured by SearchEngineDashboards from the OS	Total Average Maximum Minimum
SearchEngineDashboards	SearchEngineDashboards Memory Used	Bytes	Memory usage of SearchEngineDashboards	Total Average Maximum Minimum
SearchEngineDashboards	SearchEngineDashboards Uptime	Milliseconds	SearchEngineDashboards concurrent connection count	Total Average Maximum Minimum
SearchEngineDashboards	SearchEngineDashboards Disconnects	Count	SearchEngineDashboards uptime	Total Average Maximum Minimum
SearchEngineDashboards	SearchEngineDashboards Requests	Count	Total request count for SearchEngineDashboards	Total Average Maximum Minimum
SearchEngineDashboards	SearchEngineDashboards Reponse Time Avg	Milliseconds	SearchEngineDashboards Average response time over the last 5 seconds (milliseconds)	Total Average Maximum Minimum
SearchEngineDashboards	SearchEngineDashboards Reponse Time MAX	Milliseconds	SearchEngineDashboards Maximum response time in the last 5 seconds (milliseconds)	Total Average Maximum Minimum
SearchEngineDashboards	SearchEngineDashboards UP	None	SearchEngineDashboards /api/status status value indicating whether the API responded correctly (Up metric) 1: Success 0: Failure	Total Average Maximum Minimum
segment	Count of index segments	Count	Number of segments held by the node	Total Average Maximum Minimum
segment	Memory size of segments	Bytes	Node’s segment memory usage (bytes)	Total Average Maximum Minimum
shards	Active primary shards	Count	Active primary shard count, the number of primary shards that are operating normally in the current cluster	Total Average Maximum Minimum
shards	Active shards	Count	Total number of active primary and replica shards, i.e., the total shard count obtained by adding the primary and replica shards that are currently operating normally in the cluster.	Total Average Maximum Minimum
shards	Delayed shards	Count	Number of shards with delayed allocation, the number of shards whose placement on a node is temporarily delayed due to the configured timeout	Total Average Maximum Minimum
shards	Initializing shards	Count	Number of shards being initialized	Total Average Maximum Minimum
shards	Relocating shards	Count	Number of shards being relocated, the total number of shards moved (relocated) to other nodes in the current cluster	Total Average Maximum Minimum
shards	Unassigned shards	Count	Number of unassigned shards, meaning the total number of shards that are not allocated to any node in the cluster.	Total Average Maximum Minimum
tasks	Pending tasks	Count	A task that must be applied to the entire cluster (e.g., configuration changes, shard reallocation, index template updates, etc.) is still pending and waiting in the queue.	Total Average Maximum Minimum
translog	Total translog operations	Count/Second	Number of operations accumulated in the translog after the last flush	Total Average Maximum Minimum
translog	Total translog size	Bytes/Second	translog size (byte)	Total Average Maximum Minimum
up	SearchEngine UP	None	The status value (Up metric) indicating whether the cluster’s Cluster Info API responded correctly 1: Success 0: Failure	Total Average Maximum Minimum

Table. Search Engine basic metrics

Monitoring metrics

How-to guides