docs: Add nomad alloc signal docs

website/source/api/allocations.html.md

@@ -604,3 +604,48 @@ $ curl -X POST \
   "EvalID": "5456bd7a-9fc0-c0dd-6131-cbee77f57577",
   "Index": 54
 }
+```
+
+## Signal Allocation
+
+This endpoint sends a signal to an allocation or task.
+
+| Method | Path                       | Produces                   |
+| ------ | -------------------------- | -------------------------- |
+| `POST` / `PUT`  | `/v1/allocation/:alloc_id/signal` | `application/json`         |
+
+The table below shows this endpoint's support for
+[blocking queries](/api/index.html#blocking-queries) and
+[required ACLs](/api/index.html#acls).
+
+| Blocking Queries | ACL Required         |
+| ---------------- | -------------------- |
+| `NO`            | `namespace:alloc-lifecycle` |
+
+### Parameters
+
+- `:alloc_id` `(string: <required>)`- Specifies the UUID of the allocation. This
+  must be the full UUID, not the short 8-character one. This is specified as
+  part of the path.
+
+### Sample Payload
+
+```json
+{
+  "Signal": "SIGUSR1",
+  "Task": "FOO"
+}
+```
+
+### Sample Request
+
+```text
+$ curl -X POST -d '{"Signal": "SIGUSR1" }' \
+    https://localhost:4646/v1/client/allocation/5456bd7a-9fc0-c0dd-6131-cbee77f57577/signal
+```
+
+### Sample Response
+
+```json
+{}
+```

website/source/docs/commands/alloc.html.md.erb

@@ -20,11 +20,13 @@ subcommands are available:
 * [`alloc fs`][fs] - Inspect the contents of an allocation directory
 * [`alloc logs`][logs] - Streams the logs of a task
 * [`alloc restart`][restart] - Restart a running allocation or task
+* [`alloc signal`][signal] - Signal a running allocation
 * [`alloc status`][status] - Display allocation status information and metadata
 * [`alloc stop`][stop] - Stop and reschedule a running allocation
 
 [fs]: /docs/commands/alloc/fs.html "Inspect the contents of an allocation directory"
 [logs]: /docs/commands/alloc/logs.html "Streams the logs of a task"
 [restart]: /docs/commands/alloc/restart.html "Restart a running allocation or task"
+[status]: /docs/commands/alloc/signal.html "Signal a running allocation"
 [status]: /docs/commands/alloc/status.html "Display allocation status information and metadata"
 [stop]: /docs/commands/alloc/stop.html "Stop and reschedule a running allocation"

website/source/docs/commands/alloc/signal.html.md.erb

@@ -0,0 +1,44 @@
+---
+layout: "docs"
+page_title: "Commands: alloc signal"
+sidebar_current: "docs-commands-alloc-signal"
+description: >
+  Signal a running allocation or task
+---
+
+# Command: alloc signal
+
+The `alloc signal` command allows a user to perform an in place signal of an
+an entire allocation or individual task.
+
+## Usage
+
+```
+nomad alloc signal [options] <allocation> <task>
+```
+
+This command accepts a single allocation ID and a task name. The task name must
+be part of the allocation and the task must be currently running. The task name
+is optional and if omitted every task in the allocation will be signaled.
+
+## General Options
+
+<%= partial "docs/commands/_general_options" %>
+
+## Signal Options
+
+* `-s`: Signal to send to the tasks. Valid options depend on the driver.
+
+* `-verbose`: Display verbose output.
+
+## Examples
+
+```
+$ nomad alloc signal eb17e557
+
+$ nomad alloc signal eb17e557 foo
+Could not find task named: foo, found:
+* test
+<blocking>
+```
+

website/source/layouts/docs.erb

@@ -144,6 +144,9 @@
               <li<%= sidebar_current("docs-commands-alloc-restart") %>>
                 <a href="/docs/commands/alloc/restart.html">restart</a>
               </li>
+              <li<%= sidebar_current("docs-commands-alloc-signal") %>>
+                <a href="/docs/commands/alloc/signal.html">signal</a>
+              </li>
               <li<%= sidebar_current("docs-commands-alloc-status") %>>
                 <a href="/docs/commands/alloc/status.html">status</a>
               </li>