docs(telemetry): Give the JobQueue panel's real export interval

The per-type JobQueue values are published through beast::insight, whose
metric reader exports every second by default. The panel description said
ten seconds.

docker/telemetry/grafana/dashboards/node-health.json

@@ -5244,7 +5244,7 @@
     },
     {
       "title": "Job Queue Saturation (Running vs Limit)",
-      "description": "###### What this is:\n*How close each concurrency-capped job type is to its ceiling. JobQueue enforces a per-type limit on how many jobs of that type may run at once, and the tight ones carry ledger-sync traffic: makeFetchPack 1, ledgerRequest 3, ledgerData 3, updatePaths 1, fetchTxnData 5. A type at its ceiling cannot start more work no matter how many workers are idle, so this is a different kind of limit from CPU or disk.*\n\n###### How it's computed:\n*Each jobq_<jobtype>_running gauge divided by that type's own limit from JobTypes.h, so every line shares one 0-to-1 axis. 1.0 means running equals the limit. Multiply a reading by the limit shown in its legend to recover the raw job count. JobQueue::collect snapshots all three per-type counters under the queue's own lock and publishes them after releasing it, on the 10-second export cycle.*\n\n###### Reading it:\n*Read the distance to 1.0, not the absolute height. Below 1.0 the type has spare slots and its queue wait is not the limit's fault. Touching 1.0 briefly is normal work. Sitting at 1.0 means the type is pinned at its ceiling and every further job of that type is being deferred rather than started, which is what turns into queue wait downstream. Because the limits differ, a raw count of 3 is saturation for ledgerRequest but only 60 percent for fetchTxnData; normalizing is what makes the lines comparable.*\n\n###### Healthy range:\n*Below 1.0, with brief touches under load.*\n\n###### Watch for:\n*A line flat at 1.0: that type is the binding constraint. ledgerRequest pinned means the 3 slots shared by RcvGetLedger and RcvGetObjByHash are full, so peer ledger and object requests are queueing behind each other; the Ledger Data and Sync dashboard splits that wait by handler and shows the matching deferred depth. ledgerData or fetchTxnData pinned means inbound ledger data cannot be absorbed and validated ledger age will grow. makeFetchPack or updatePaths pinned at their limit of 1 means a single long job is blocking the whole type. These are sampled gauges, so a line that never reaches 1.0 is not proof the type was never momentarily saturated.*\n\n###### Keywords:\n- **Job queue / job type** *(per node)* \u2014 xrpld's worker-thread pool; every unit of background work is enqueued under a named job type.\n- **Concurrency limit** *(per node)* \u2014 the cap on how many jobs of one type may run at once; a type at its cap cannot start more work.\n- **Deferred job** *(per node)* \u2014 a job held back because its type is already at its concurrency limit; the leading indicator of queue backpressure.\n\n###### Computation boundary:\n*Result: Per node \u2014 each series is one server's own value.*\n*Recorded in xrpld code as a native metric (beast::insight); the collector only forwards it; the Grafana query selects and aggregates it.*\n\n###### Source:\n[core/JobQueue.cpp](https://github.com/XRPLF/rippled/blob/develop/src/libxrpl/core/detail/JobQueue.cpp)\n\n###### Function:\n`JobQueue::getNextJob (limit enforcement) / JobQueue::collect (publication)`\n\n###### References:\n[Telemetry glossary](https://github.com/XRPLF/rippled/blob/develop/docs/telemetry-glossary.md#concurrency-limit)",
+      "description": "###### What this is:\n*How close each concurrency-capped job type is to its ceiling. JobQueue enforces a per-type limit on how many jobs of that type may run at once, and the tight ones carry ledger-sync traffic: makeFetchPack 1, ledgerRequest 3, ledgerData 3, updatePaths 1, fetchTxnData 5. A type at its ceiling cannot start more work no matter how many workers are idle, so this is a different kind of limit from CPU or disk.*\n\n###### How it's computed:\n*Each jobq_<jobtype>_running gauge divided by that type's own limit from JobTypes.h, so every line shares one 0-to-1 axis. 1.0 means running equals the limit. Multiply a reading by the limit shown in its legend to recover the raw job count. JobQueue::collect snapshots all three per-type counters under the queue's own lock and publishes them after releasing it, on the 1-second export cycle.*\n\n###### Reading it:\n*Read the distance to 1.0, not the absolute height. Below 1.0 the type has spare slots and its queue wait is not the limit's fault. Touching 1.0 briefly is normal work. Sitting at 1.0 means the type is pinned at its ceiling and every further job of that type is being deferred rather than started, which is what turns into queue wait downstream. Because the limits differ, a raw count of 3 is saturation for ledgerRequest but only 60 percent for fetchTxnData; normalizing is what makes the lines comparable.*\n\n###### Healthy range:\n*Below 1.0, with brief touches under load.*\n\n###### Watch for:\n*A line flat at 1.0: that type is the binding constraint. ledgerRequest pinned means the 3 slots shared by RcvGetLedger and RcvGetObjByHash are full, so peer ledger and object requests are queueing behind each other; the Ledger Data and Sync dashboard splits that wait by handler and shows the matching deferred depth. ledgerData or fetchTxnData pinned means inbound ledger data cannot be absorbed and validated ledger age will grow. makeFetchPack or updatePaths pinned at their limit of 1 means a single long job is blocking the whole type. These are sampled gauges, so a line that never reaches 1.0 is not proof the type was never momentarily saturated.*\n\n###### Keywords:\n- **Job queue / job type** *(per node)* \u2014 xrpld's worker-thread pool; every unit of background work is enqueued under a named job type.\n- **Concurrency limit** *(per node)* \u2014 the cap on how many jobs of one type may run at once; a type at its cap cannot start more work.\n- **Deferred job** *(per node)* \u2014 a job held back because its type is already at its concurrency limit; the leading indicator of queue backpressure.\n\n###### Computation boundary:\n*Result: Per node \u2014 each series is one server's own value.*\n*Recorded in xrpld code as a native metric (beast::insight); the collector only forwards it; the Grafana query selects and aggregates it.*\n\n###### Source:\n[core/JobQueue.cpp](https://github.com/XRPLF/rippled/blob/develop/src/libxrpl/core/detail/JobQueue.cpp)\n\n###### Function:\n`JobQueue::getNextJob (limit enforcement) / JobQueue::collect (publication)`\n\n###### References:\n[Telemetry glossary](https://github.com/XRPLF/rippled/blob/develop/docs/telemetry-glossary.md#concurrency-limit)",
       "type": "timeseries",
       "gridPos": {
         "h": 10,