> ## Documentation Index > Fetch the complete documentation index at: https://docs.gcore.com/llms.txt > Use this file to discover all available pages before exploring further. # Update load balancer pool health monitor > Updates the health monitor of a load balancer pool, such as its check intervals, timeouts, and the thresholds used to mark pool members as healthy or unhealthy. Only the supplied fields are changed. Returns 404 if the pool has no health monitor attached. If a provided field already matches the current health monitor state it is skipped, and when no field changes anything no task is created and an empty task list is returned. ## OpenAPI ````yaml /api-reference/services_docs_mintlify_enriched/cloud_api.yaml patch /cloud/v1/lbpools/{project_id}/{region_id}/{pool_id}/healthmonitor openapi: 3.1.0 info: title: Gcore OpenAPI – Cloud API description: >- This OpenAPI is an aggregated OpenAPI specification that unifies all Gcore products into a single file. It covers Cloud, CDN, DNS, WAAP, DDoS Protection, Object Storage, Streaming, and FastEdge services. version: e4facaa17275 servers: - url: https://api.gcore.com security: - APIKey: [] tags: - name: Bare Metal - name: Container as a Service - name: Cost Reports - name: DDoS Protection - name: Everywhere Inference - name: Everywhere Inference Apps - name: File Shares - name: Floating IPs - name: Function as a Service - name: GPU Bare Metal - name: GPU Virtual - name: IP Ranges - name: Images - name: Instances - name: Load Balancers - name: Logging - name: Managed Kubernetes - name: Managed PostgreSQL - name: Networks - name: Placement Groups - name: Ports - name: Projects - name: Quotas - name: Regions - name: Registry - name: Reservations - name: Reserved IPs - name: Routers - name: SSH Keys - name: Secrets - name: Security Groups - name: Snapshot Schedules - name: Snapshots - name: Tasks - name: User Actions - name: User Role Assignments - name: Volumes paths: /cloud/v1/lbpools/{project_id}/{region_id}/{pool_id}/healthmonitor: patch: tags: - Load Balancers summary: Update load balancer pool health monitor description: >- Updates the health monitor of a load balancer pool, such as its check intervals, timeouts, and the thresholds used to mark pool members as healthy or unhealthy. Only the supplied fields are changed. Returns 404 if the pool has no health monitor attached. If a provided field already matches the current health monitor state it is skipped, and when no field changes anything no task is created and an empty task list is returned. operationId: LoadBalancerPoolInstanceHealthMonitorViewSet.patch parameters: - in: path name: project_id required: true description: Project ID schema: description: Project ID example: 1 examples: - 1 title: Project Id type: integer - in: path name: region_id required: true description: Region ID schema: description: Region ID example: 1 examples: - 1 exclusiveMinimum: 0 title: Region Id type: integer - in: path name: pool_id required: true description: Pool ID schema: description: Pool ID example: 00000000-0000-4000-8000-000000000000 examples: - 00000000-0000-4000-8000-000000000000 format: uuid4 title: Pool Id type: string requestBody: content: application/json: schema: $ref: '#/components/schemas/PatchLbHealthMonitorSerializerV2' responses: '200': description: OK content: application/json: schema: $ref: '#/components/schemas/TaskIDsSerializer' components: schemas: PatchLbHealthMonitorSerializerV2: properties: admin_state_up: description: >- Administrative state of the resource. Omit to leave unchanged; `false` disables the resource so it will not process traffic. example: true examples: - true - false title: Admin State Up type: boolean delay: description: >- The time, in seconds, between sending probes to members. Omit to leave unchanged. example: 10 examples: - 10 maximum: 2147483647 minimum: 1 title: Delay type: integer domain_name: anyOf: - pattern: ^[A-Za-z0-9._-]{1,253}$ type: string - type: 'null' description: >- Domain name for HTTP host header. Can only be used together with `HTTP` or `HTTPS` health monitor type. Omit to leave unchanged. Set to `null` to clear the current value. examples: - example.com title: Domain Name expected_codes: anyOf: - pattern: ^(\d{3}(\s*,\s*\d{3})*)$|^(\d{3}-\d{3})$ type: string - type: 'null' description: >- Expected HTTP response codes. Can be a single code, a comma-separated list of codes, or a single range of codes. Can only be used together with `HTTP` or `HTTPS` health monitor type. For example, 200, 200,202,401,403,404, or 200-204. Omit to leave unchanged. Set to `null` to clear the current value. examples: - 200,301,302 title: Expected Codes http_method: anyOf: - $ref: '#/components/schemas/HttpMethodEnum' - type: 'null' description: >- HTTP method. Can only be used together with `HTTP` or `HTTPS` health monitor type. Omit to leave unchanged. Set to `null` to clear the current value. examples: - CONNECT - DELETE - GET - HEAD - OPTIONS - PATCH - POST - PUT - TRACE http_version: anyOf: - enum: - '1.0' - '1.1' type: string - type: 'null' description: >- HTTP version. Can only be used together with `HTTP` or `HTTPS` health monitor type. Supported values: 1.0, 1.1. Omit to leave unchanged. Set to `null` to clear the current value. examples: - '1.1' - '1.0' title: Http Version max_retries: description: >- Number of successes before the member is switched to ONLINE state. Omit to leave unchanged. example: 2 examples: - 2 maximum: 10 minimum: 1 title: Max Retries type: integer max_retries_down: description: >- Number of failures before the member is switched to ERROR state. Omit to leave unchanged. example: 2 examples: - 2 maximum: 10 minimum: 1 title: Max Retries Down type: integer timeout: description: >- The maximum time to connect. Must be less than the delay value. Omit to leave unchanged. example: 5 examples: - 5 maximum: 2147483 minimum: 0 title: Timeout type: integer url_path: anyOf: - pattern: ^/([^/?#%]+(/[^/?#%]+)*/?)?$ type: string - type: 'null' description: >- The HTTP path the health monitor requests on each member. Can only be used with `HTTP` or `HTTPS` health monitor type. Must start with `/` and contain only plain path segments. Query strings (`?`), fragments (`#`), percent-encoding (`%`), and consecutive slashes (`//`) are not allowed. Examples of valid paths: - `/` — check the root (most common) - `/healthz` — a dedicated health endpoint Omit to leave unchanged. Set to `null` to clear the current value. examples: - / - /healthz title: Url Path title: PatchLbHealthMonitorSerializerV2 type: object TaskIDsSerializer: properties: tasks: description: >- List of task IDs representing asynchronous operations. Use these IDs to monitor operation progress: - `GET /v1/tasks/{task_id}` - Check individual task status and details Poll task status until completion (`FINISHED`/`ERROR`) before proceeding with dependent operations. example: - d478ae29-dedc-4869-82f0-96104425f565 examples: - - d478ae29-dedc-4869-82f0-96104425f565 items: type: string title: Tasks type: array required: - tasks title: TaskIDsSerializer type: object HttpMethodEnum: enum: - CONNECT - DELETE - GET - HEAD - OPTIONS - PATCH - POST - PUT - TRACE title: HttpMethodEnum type: string securitySchemes: APIKey: description: >- API key for authentication. Make sure to include the word `apikey`, followed by a single space and then your token. Example: `apikey 1234_abcdef` type: apiKey in: header name: Authorization ````