Server 4.0 Stats graphing stops

Question

The graphing on the stats pane stops, and the only way I've found to restart it is to reboot the server machine.
I have a couple of machines running Server 4.0, and only one of them has this problem. The server will run for a couple of days, then the graps stop. If I reboot, the graphs come back—with the gap where the information was apparently not being captured.
The gaps appear both on a local instance of Server, running on the server machine itself, and on a remote instance, running on another machine.
It affects all statistics:
System: Processor Usage
System: Memory Usage
System: Memory Pressure
System: Network Traffic
Caching: Bytes Served
File Sharing: Connected Users
In digging, I've found that the OS X Server documentation is spectacularly out of date (10.3). The afp:command = getHistory, for instance, no longer seems to exist, and there is no way I've found to get a module (afp for instance) to list its available subcommands: neither serveradmin command afp:command = help nor serveradmin command afp:command = list work.
I obviously don't want to interrupt the server by rebooting it frequently. Any ideas how to restart the stats gathering non-intrusively?

Answer 1

I have found a little more:
The process doing the logging appears to be servermetricsd
Some digging reveals
$ ps ax|grep servermetricsd
  228   ??  Ss     8:00.98 /Applications/Server.app/Contents/ServerRoot/usr/libexec/servermetricsd.app/Contents/MacOS/servermetricsd -daemonize YES
$ sudo launchctl list | grep servermetricsd
- 0 com.apple.servermetricsd.sample
228 0 com.apple.servermetricsd.daemon
$ sudo launchctl list com.apple.servermetricsd.daemon
  "LimitLoadToSessionType" = "System";
  "MachServices" = {
  "com.apple.servermetricsd" = mach-port-object;
  "Label" = "com.apple.servermetricsd.daemon";
  "TimeOut" = 30;
  "OnDemand" = false;
  "LastExitStatus" = 0;
  "PID" = 228;
  "Program" = "/Applications/Server.app/Contents/ServerRoot/usr/libexec/servermetricsd.app/Contents/MacOS/servermetricsd";
  "ProgramArguments" = (
  "/Applications/Server.app/Contents/ServerRoot/usr/libexec/servermetricsd.app/Contents/MacOS/servermetricsd";
  "-daemonize";
  "YES";
$ sudo launchctl list com.apple.servermetricsd.sample
  "LimitLoadToSessionType" = "System";
  "Label" = "com.apple.servermetricsd.sample";
  "TimeOut" = 30;
  "OnDemand" = true;
  "LastExitStatus" = 0;
  "Program" = "/Applications/Server.app/Contents/ServerRoot/usr/libexec/servermetricsd.app/Contents/MacOS/servermetricsd";
  "ProgramArguments" = (
  "/Applications/Server.app/Contents/ServerRoot/usr/libexec/servermetricsd.app/Contents/MacOS/servermetricsd";
$ sudo launchctl print system/com.apple.servermetricsd.daemon
com.apple.servermetricsd.daemon = {
  active count = 2
  path = (submitted by smd.218)
  state = running
  program = /Applications/Server.app/Contents/ServerRoot/usr/libexec/servermetricsd.app/Contents/MacOS/servermetricsd
  arguments = {
  /Applications/Server.app/Contents/ServerRoot/usr/libexec/servermetricsd.app/Contents/MacOS/servermetricsd
  -daemonize
  YES
  global environment = {
  PATH => /usr/bin:/bin:/usr/sbin:/sbin
  environment = {
  SERVER_INSTALL_PATH_PREFIX => /Applications/Server.app/Contents/ServerRoot
  XPC_SERVICE_NAME => com.apple.servermetricsd.daemon
  domain = com.apple.xpc.launchd.domain.system
  minimum runtime = 10
  exit timeout = 5
  runs = 1
  successive crashes = 0
  excessive crashing = 0
  pid = 228
  immediate reason = speculative
  forks = 0
  execs = 1
  trampolined = 1
  last exit code = (never exited)
  event triggers = {
  endpoints = {
  "com.apple.servermetricsd" = {
  port = 0x1d5df
  active = 1
  managed = 1
  reset = 0
  hide = 0
  dynamic endpoints = {
  pid-local endpoints = {
  instance-specific endpoints = {
  event channels = {
  sockets = {
  spawn type = daemon
  properties = {
  partial import = 0
  launchd bundle = 0
  xpc bundle = 0
  keepalive = 1
  runatload = 0
  dirty at shutdown = 0
  low priority i/o = 0
  low priority background i/o = 0
  legacy timer behavior = 0
  exception handler = 0
  multiple instances = 0
  supports transactions = 0
  supports pressured exit = 0
  enter kdp before kill = 0
  wait for debugger = 0
  app = 0
  system app = 0
  creates session = 0
  inetd-compatible = 0
  inetd listener = 0
  abandon process group = 0
  one-shot = 0
  requires reap = 0
  event monitor = 0
  penalty box = 0
  pended non-demand spawn = 0
  role account = 0
  launch only once = 0
  system support = 0
  app-like = 0
  inferred program = 1
  joins gui session = 0
  joins host session = 0
  parameterized sandbox = 0
  resolve program = 0
  abandon coalition = 0
  extension = 0
  nano allocator = 0
  no initgroups = 0
  start on fs mount = 0
$ sudo launchctl print system/com.apple.servermetricsd.sample
com.apple.servermetricsd.sample = {
  active count = 0
  path = (submitted by smd.218)
  state = waiting
  program = /Applications/Server.app/Contents/ServerRoot/usr/libexec/servermetricsd.app/Contents/MacOS/servermetricsd
  arguments = {
  /Applications/Server.app/Contents/ServerRoot/usr/libexec/servermetricsd.app/Contents/MacOS/servermetricsd
  global environment = {
  PATH => /usr/bin:/bin:/usr/sbin:/sbin
  environment = {
  SERVER_INSTALL_PATH_PREFIX => /Applications/Server.app/Contents/ServerRoot
  XPC_SERVICE_NAME => com.apple.servermetricsd.sample
  domain = com.apple.xpc.launchd.domain.system
  minimum runtime = 10
  exit timeout = 5
  runs = 924
  successive crashes = 0
  excessive crashing = 0
  last exit code = 0
  event triggers = {
  com.apple.servermetricsd.sample.268435471 => {
  state = 0
  service = com.apple.servermetricsd.sample
  stream = com.apple.launchd.calendarinterval.system
  monitor = com.apple.UserEventAgent-System
  descriptor = {
  "Minute" => 10
  com.apple.servermetricsd.sample.268435478 => {
  state = 0
  service = com.apple.servermetricsd.sample
  stream = com.apple.launchd.calendarinterval.system
  monitor = com.apple.UserEventAgent-System
  descriptor = {
  "Minute" => 45
  com.apple.servermetricsd.sample.268435470 => {
  state = 0
  service = com.apple.servermetricsd.sample
  stream = com.apple.launchd.calendarinterval.system
  monitor = com.apple.UserEventAgent-System
  descriptor = {
  "Minute" => 5
  com.apple.servermetricsd.sample.268435477 => {
  state = 0
  service = com.apple.servermetricsd.sample
  stream = com.apple.launchd.calendarinterval.system
  monitor = com.apple.UserEventAgent-System
  descriptor = {
  "Minute" => 40
  com.apple.servermetricsd.sample.268435476 => {
  state = 0
  service = com.apple.servermetricsd.sample
  stream = com.apple.launchd.calendarinterval.system
  monitor = com.apple.UserEventAgent-System
  descriptor = {
  "Minute" => 35
  com.apple.servermetricsd.sample.268435475 => {
  state = 0
  service = com.apple.servermetricsd.sample
  stream = com.apple.launchd.calendarinterval.system
  monitor = com.apple.UserEventAgent-System
  descriptor = {
  "Minute" => 30
  com.apple.servermetricsd.sample.268435480 => {
  state = 0
  service = com.apple.servermetricsd.sample
  stream = com.apple.launchd.calendarinterval.system
  monitor = com.apple.UserEventAgent-System
  descriptor = {
  "Minute" => 55
  com.apple.servermetricsd.sample.268435469 => {
  state = 0
  service = com.apple.servermetricsd.sample
  stream = com.apple.launchd.calendarinterval.system
  monitor = com.apple.UserEventAgent-System
  descriptor = {
  "Minute" => 0
  com.apple.servermetricsd.sample.268435474 => {
  state = 0
  service = com.apple.servermetricsd.sample
  stream = com.apple.launchd.calendarinterval.system
  monitor = com.apple.UserEventAgent-System
  descriptor = {
  "Minute" => 25
  com.apple.servermetricsd.sample.268435473 => {
  state = 0
  service = com.apple.servermetricsd.sample
  stream = com.apple.launchd.calendarinterval.system
  monitor = com.apple.UserEventAgent-System
  descriptor = {
  "Minute" => 25
  com.apple.servermetricsd.sample.268435472 => {
  state = 0
  service = com.apple.servermetricsd.sample
  stream = com.apple.launchd.calendarinterval.system
  monitor = com.apple.UserEventAgent-System
  descriptor = {
  "Minute" => 15
  com.apple.servermetricsd.sample.268435479 => {
  state = 0
  service = com.apple.servermetricsd.sample
  stream = com.apple.launchd.calendarinterval.system
  monitor = com.apple.UserEventAgent-System
  descriptor = {
  "Minute" => 50
  endpoints = {
  dynamic endpoints = {
  pid-local endpoints = {
  instance-specific endpoints = {
  event channels = {
  "com.apple.launchd.calendarinterval" = {
  port = 0x1d6c3
  active = 0
  managed = 1
  reset = 0
  hide = 0
  sockets = {
  spawn type = daemon
  properties = {
  partial import = 0
  launchd bundle = 0
  xpc bundle = 0
  keepalive = 0
  runatload = 0
  dirty at shutdown = 0
  low priority i/o = 0
  low priority background i/o = 0
  legacy timer behavior = 0
  exception handler = 0
  multiple instances = 0
  supports transactions = 0
  supports pressured exit = 0
  enter kdp before kill = 0
  wait for debugger = 0
  app = 0