Apache ZooKeeper Monitoring API
Server statistics and metrics
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OpenAPI Specification
openapi: 3.2.0
info:
title: Apache ZooKeeper Admin Server Cluster Monitoring API
description: The ZooKeeper Admin Server provides an HTTP interface for monitoring and management commands. It exposes four-letter-word equivalent commands as REST endpoints for cluster monitoring, configuration, and diagnostics.
version: 3.9.0
contact:
name: Apache ZooKeeper
url: https://zookeeper.apache.org/
license:
name: Apache 2.0
url: https://www.apache.org/licenses/LICENSE-2.0
servers:
- url: http://localhost:8080/commands
description: Local ZooKeeper Admin Server
- url: http://{zk_host}:{port}/commands
description: Custom ZooKeeper Admin Server
variables:
zk_host:
default: localhost
port:
default: '8080'
tags:
- name: Monitoring
description: Server statistics and metrics
paths:
/cons:
get:
operationId: getConnections
summary: Apache ZooKeeper List Client Connections
description: Returns information about all client connections. Equivalent to the 'cons' four-letter-word command.
tags:
- Monitoring
responses:
'200':
description: Client connections information
content:
application/json:
schema:
type: object
properties:
connections:
type: array
items:
type: object
properties:
remote_address:
type: string
interest_ops:
type: integer
outstanding_requests:
type: integer
packets_received:
type: integer
packets_sent:
type: integer
session_id:
type: string
session_timeout:
type: integer
last_operation:
type: string
last_latency:
type: integer
min_latency:
type: integer
avg_latency:
type: number
max_latency:
type: integer
last_response_timestamp:
type: integer
command:
type: string
error:
type: string
nullable: true
examples:
GetConnections200Example:
summary: Default getConnections 200 response
x-microcks-default: true
value: {}
x-microcks-operation:
delay: 0
dispatcher: FALLBACK
/crst:
get:
operationId: resetConnectionStats
summary: Apache ZooKeeper Reset Connection Statistics
description: Resets all connection statistics. Equivalent to the 'crst' command.
tags:
- Monitoring
responses:
'200':
description: Statistics reset
content:
application/json:
schema:
type: object
properties:
command:
type: string
error:
type: string
nullable: true
examples:
ResetConnectionStats200Example:
summary: Default resetConnectionStats 200 response
x-microcks-default: true
value: {}
x-microcks-operation:
delay: 0
dispatcher: FALLBACK
/dump:
get:
operationId: getDump
summary: Apache ZooKeeper List Sessions and Ephemeral Nodes
description: Lists the outstanding sessions and ephemeral nodes. Equivalent to the 'dump' four-letter-word command.
tags:
- Monitoring
responses:
'200':
description: Session and ephemeral node information
content:
application/json:
schema:
type: object
properties:
sessions:
type: array
items:
type: object
properties:
session_id:
type: string
timeout:
type: integer
ephemeral_nodes:
type: array
items:
type: string
command:
type: string
error:
type: string
nullable: true
examples:
GetDump200Example:
summary: Default getDump 200 response
x-microcks-default: true
value: {}
x-microcks-operation:
delay: 0
dispatcher: FALLBACK
/stat:
get:
operationId: getServerStats
summary: Apache ZooKeeper Get Server Statistics
description: Lists brief details for the server and connected clients. Equivalent to the 'stat' four-letter-word command.
tags:
- Monitoring
responses:
'200':
description: Server statistics
content:
application/json:
schema:
type: object
properties:
version:
type: string
read_only:
type: boolean
server_state:
type: string
enum:
- leader
- follower
- standalone
- observer
znode_count:
type: integer
packet_sent_count:
type: integer
packet_received_count:
type: integer
min_latency:
type: integer
avg_latency:
type: number
max_latency:
type: integer
num_alive_connections:
type: integer
outstanding_requests:
type: integer
approximate_data_size:
type: integer
open_file_descriptor_count:
type: integer
max_file_descriptor_count:
type: integer
last_client_response_timestamp:
type: integer
connections:
type: array
items:
type: object
command:
type: string
error:
type: string
nullable: true
examples:
GetServerStats200Example:
summary: Default getServerStats 200 response
x-microcks-default: true
value: {}
x-microcks-operation:
delay: 0
dispatcher: FALLBACK
/srvr:
get:
operationId: getServerInfo
summary: Apache ZooKeeper Get Full Server Details
description: Lists full details for the server. Equivalent to the 'srvr' four-letter-word command.
tags:
- Monitoring
responses:
'200':
description: Full server details
content:
application/json:
schema:
type: object
properties:
version:
type: string
read_only:
type: boolean
server_state:
type: string
znode_count:
type: integer
approximate_data_size:
type: integer
max_latency:
type: integer
min_latency:
type: integer
avg_latency:
type: number
packet_sent_count:
type: integer
packet_received_count:
type: integer
num_alive_connections:
type: integer
outstanding_requests:
type: integer
server_id:
type: integer
proposal_sizes:
type: string
command:
type: string
error:
type: string
nullable: true
examples:
GetServerInfo200Example:
summary: Default getServerInfo 200 response
x-microcks-default: true
value: {}
x-microcks-operation:
delay: 0
dispatcher: FALLBACK
/srst:
get:
operationId: resetStats
summary: Apache ZooKeeper Reset Server Statistics
description: Resets server statistics. Equivalent to the 'srst' command.
tags:
- Monitoring
responses:
'200':
description: Statistics reset
content:
application/json:
schema:
type: object
properties:
command:
type: string
error:
type: string
nullable: true
examples:
ResetStats200Example:
summary: Default resetStats 200 response
x-microcks-default: true
value: {}
x-microcks-operation:
delay: 0
dispatcher: FALLBACK
/mntr:
get:
operationId: getMonitorMetrics
summary: Apache ZooKeeper Get Monitoring Metrics
description: Returns a list of variables for monitoring the health of the cluster. Equivalent to the 'mntr' four-letter-word command.
tags:
- Monitoring
responses:
'200':
description: Monitoring metrics
content:
application/json:
schema:
type: object
properties:
zk_version:
type: string
zk_avg_latency:
type: number
zk_max_latency:
type: integer
zk_min_latency:
type: integer
zk_packets_received:
type: integer
zk_packets_sent:
type: integer
zk_num_alive_connections:
type: integer
zk_outstanding_requests:
type: integer
zk_server_state:
type: string
zk_znode_count:
type: integer
zk_watch_count:
type: integer
zk_ephemerals_count:
type: integer
zk_approximate_data_size:
type: integer
zk_open_file_descriptor_count:
type: integer
zk_max_file_descriptor_count:
type: integer
zk_followers:
type: integer
description: Leader only
zk_synced_followers:
type: integer
description: Leader only
zk_pending_syncs:
type: integer
description: Leader only
zk_last_proposal_size:
type: integer
zk_max_proposal_size:
type: integer
zk_min_proposal_size:
type: integer
command:
type: string
error:
type: string
nullable: true
examples:
GetMonitorMetrics200Example:
summary: Default getMonitorMetrics 200 response
x-microcks-default: true
value: {}
x-microcks-operation:
delay: 0
dispatcher: FALLBACK
/hash:
get:
operationId: getHash
summary: Apache ZooKeeper Get Data Tree Digest
description: Returns the digest of the data tree.
tags:
- Monitoring
responses:
'200':
description: Data tree digest
content:
application/json:
schema:
type: object
properties:
digests:
type: object
command:
type: string
error:
type: string
nullable: true
examples:
GetHash200Example:
summary: Default getHash 200 response
x-microcks-default: true
value: {}
x-microcks-operation:
delay: 0
dispatcher: FALLBACK
/last_snapshot:
get:
operationId: getLastSnapshot
summary: Apache ZooKeeper Get Last Snapshot Info
description: Returns information about the last snapshot taken.
tags:
- Monitoring
responses:
'200':
description: Last snapshot information
content:
application/json:
schema:
type: object
properties:
last_snapshot_zxid:
type: string
last_snapshot_size:
type: integer
command:
type: string
error:
type: string
nullable: true
examples:
GetLastSnapshot200Example:
summary: Default getLastSnapshot 200 response
x-microcks-default: true
value: {}
x-microcks-operation:
delay: 0
dispatcher: FALLBACK