vHSM Telemetry Parameters

Learn about the telemetry parameters that you need for an aggregation software such as Prometheus.

The vHSM server collects runtime telemetry to provide insight into the performance of its internal components and subsystems. Metrics are aggregated every 10 seconds and stored in-memory for one minute. High-cardinality metrics, are reported every 10 minutes, or at a custom interval defined in the telemetry stanza.

To persist and monitor these metrics, vHSM can stream telemetry data to external aggregation software such as Prometheus.

These tools can be configured within vHSM’s telemetry stanza to receive and process metrics for long-term storage and monitoring. For example, Prometheus can scrape metrics from the /v1/sys/metrics endpoint for visualization and alerting.

Common Parameters

Parameter	Type	Default	Description
usage_gauge_period	string	"10m"	Interval for collecting high-cardinality usage data. Set to "none" to disable.
maximum_gauge_cardinality	int	500	Maximum cardinality of gauge labels.
disable_hostname	bool	false	Prefixes gauge values with the local hostname if set to false.
enable_hostname_label	bool	false	Adds host label with local hostname to all metrics. Recommended to enable disable_hostname if this is used.
metrics_prefix	string	"vhsm"	Prefix for metric values.
lease_metrics_epsilon	string	"1h"	Size of buckets for lease expiration metrics.
num_lease_metrics_buckets	int	168	Number of lease expiration buckets.
add_lease_metrics_namespace_labels	bool	false	Adds namespace labels to lease expiration metrics. May increase cardinality.
add_mount_point_rollback_metrics	bool	false	Enables rollback metrics per mount point. May increase cardinality.
filter_default	bool	true	Whether to allow metrics not matched by any filter.
prefix_filter	array	[]	Filters metrics by prefix. Example: ["+vhsm.token", "-vhsm.expire"]

Prometheus Parameters

Parameter	Type	Default	Description
prometheus_retention_time	string	"24h"	Duration Prometheus metrics are retained. Set to 0 to disable.
disable_hostname	bool	false	Disables hostname prefix in metrics. Recommended to enable for Prometheus.

Prometheus Endpoint

The /v1/sys/metrics endpoint is only accessible on active vHSM nodes. To enable it on standby nodes, unauthenticated metrics access must be enabled. Querying the endpoint with headers such as Accept: prometheus/telemetry will return Prometheus-formatted data.

Authorization

A vHSM token with ["read", "list"] capabilities to /v1/sys/metrics is required. The Prometheus bearer_token or bearer_token_file must be specified.

Prometheus Scrape Job Example

# prometheus.yml
scrape_configs:
  - job_name: 'vhsm'
    metrics_path: "/v1/sys/metrics"
    scheme: https
    tls_config:
      ca_file: <your_ca_here.pem>
    bearer_token: "<your_vhsm_token_here>"
    static_configs:
      - targets: ['<your_vhsm_server_here:8200>']

vHSM Telemetry Configuration Example

telemetry {
  prometheus_retention_time = "30s"
  disable_hostname = true
}