Merge pull request #1139 from simonpasquier/add-max-vsize-process-metric

instrumenting: add process_virtual_memory_max_bytes

content/docs/instrumenting/writing_clientlibs.md

@@ -334,11 +334,12 @@ doesn't expose one of the variables it'd just not export it. All memory values
 in bytes, all times in unixtime/seconds.
 
 | Metric name                        | Help string                                            | Unit             |
-| ------------------------------- | ------------------------------------------------------ | ---------------  |
+| ---------------------------------- | ------------------------------------------------------ | ---------------  |
 | `process_cpu_seconds_total`        | Total user and system CPU time spent in seconds.       | seconds          |
 | `process_open_fds`                 | Number of open file descriptors.                       | file descriptors |
 | `process_max_fds`                  | Maximum number of open file descriptors.               | file descriptors |
 | `process_virtual_memory_bytes`     | Virtual memory size in bytes.                          | bytes            |
+| `process_virtual_memory_max_bytes` | Maximum amount of virtual memory available in bytes.   | bytes            |
 | `process_resident_memory_bytes`    | Resident memory size in bytes.                         | bytes            |
 | `process_heap_bytes`               | Process heap size in bytes.                            | bytes            |
 | `process_start_time_seconds`       | Start time of the process since unix epoch in seconds. | seconds          |