Docs: Update Internals > Telemetry (#9323)

* Docs: Update Internals > Telemetry

- More clarification and detail around vault.core.leadership_lost

* Update website/pages/docs/internals/telemetry.mdx

Co-authored-by: Mark Gritter <mgritter@hashicorp.com>

* Docs: Telemetry vault.core.leadership_lost

Improved text reading.

* Update website/pages/docs/internals/telemetry.mdx

Co-authored-by: Loann Le <84412881+taoism4504@users.noreply.github.com>

* Docs: Telemetry vault.core.leadership_lost clarity.

Co-authored-by: Mark Gritter <mgritter@hashicorp.com>
Co-authored-by: aphorise <aphorise@gmail.com>
Co-authored-by: Loann Le <84412881+taoism4504@users.noreply.github.com>
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@ -93,7 +93,9 @@ These metrics represent operational aspects of the running Vault instance.
| `vault.core.handle_login_request` | Duration of time taken by login requests handled by Vault core | ms | summary |
| `vault.core.in_flight_requests` | Number of in-flight requests. | requests | gauge |
| `vault.core.leadership_setup_failed` | Duration of time taken by cluster leadership setup failures which have occurred in a highly available Vault cluster. This should be monitored and alerted on for overall cluster leadership status. | ms | summary |
| `vault.core.leadership_lost` | Duration of time taken by cluster leadership set-up failures losses which have occurred in a highly available Vault cluster. This should be monitored and alerted on for overall cluster leadership status. | ms | summary |
| `vault.core.leadership_lost` | The total duration that a HA cluster node maintained leadership as reported at the last time of loss. Any count greater than zero means that a leadership change has occurred. Continuing changes or reports of low value could be a cause for monitoring alerts as they would typically imply ongoing flapping of leadership that may rotate between nodes. | ms | summary |
| `vault.core.license.expiration_time_epoch` | Time as epoch (seconds since Jan 1 1970) at which license will expire. | seconds | gauge |
| `vault.core.mount_table.num_entries` | Number of mounts in a particular mount table. This metric is labeled by table type (auth or logical) and whether or not the table is replicated (local or not) | objects | gauge |
| `vault.core.mount_table.size` | Size of a particular mount table. This metric is labeled by table type (auth or logical) and whether or not the table is replicated (local or not) | bytes | gauge |