Description of problem:

With basic configuration:

```
NFS_CORE_PARAM { Protocols = NFSv4; Enable_RQUOTA = false; Mount_Path_Pseudo = true; Enable_FULLV4_Stats = true; }
EXPORT_DEFAULTS { Access_Type = RW; Squash = root_squash; Attr_Expiration_Time = 60; CLIENT { Clients = *; } }
EXPORT { Export_id = 1; Path = "/storage/1"; Pseudo = "/1"; FSAL { Name = VFS; } }
```

Address crash on first mount:

```
 0  0x0000fffff7ad4220 in __aarch64_ldadd8_acq_rel () from /lib64/libgmonitoring.so
 1  0x0000fffff7abfe20 in std::__atomic_base<long>::operator+= (this=0x10, __i=1) at /usr/include/c++/11.2.0/bits/atomic_base.h:394
 2  0x0000fffff7abc4b0 in prometheus::Gauge<long>::Increment (this=0x0, val=@0xfffff1e0d800: 1) at /nfs-ganesha/src/monitoring/prometheus-cpp-lite/core/include/prometheus/gauge.h:45
 3  0x0000fffff7ab5ae8 in ganesha_monitoring::monitoring__gauge_inc (handle=..., value=1) at /nfs-ganesha/src/monitoring/monitoring.cc:408
 4  0x0000fffff7ca97d0 in connection_manager_metrics__client_state_inc (state=CONNECTION_MANAGER__CLIENT_STATE__DRAINED) at /nfs-ganesha/src/RPCAL/connection_manager_metrics.c:158
 5  0x0000fffff7ca6bcc in connection_manager__client_init (client=0xffffc40097d8) at /nfs-ganesha/src/RPCAL/connection_manager.c:200
 6  0x0000fffff7c71578 in get_gsh_client (client_ipaddr=0xffffc4000c08, lookup_only=false) at /nfs-ganesha/src/support/client_mgr.c:198
 7  0x0000fffff7ca8560 in connection_manager__connection_started (xprt=0xffffc4000b10) at /nfs-ganesha/src/RPCAL/connection_manager.c:514
 8  0x0000fffff7c64db4 in nfs_rpc_dispatch_remote_addr_set_tcp (xprt=0xffffc4000b10) at /nfs-ganesha/src/MainNFSD/nfs_rpc_dispatcher_thread.c:426
 9  0x0000fffff7f90f28 in update_and_notify_remote_address_set (xprt=0xffffc4000b10) at /nfs-ganesha/src/libntirpc/src/svc_vc.c:752
 10 0x0000fffff7f92510 in svc_vc_recv (xprt=0xffffc4000b10) at /nfs-ganesha/src/libntirpc/src/svc_vc.c:1154
 11 0x0000fffff7f8cc00 in svc_rqst_xprt_task_recv (wpe=0xffffc4000de8) at /nfs-ganesha/src/libntirpc/src/svc_rqst.c:1210
 12 0x0000fffff7f8d914 in svc_rqst_epoll_loop (wpe=0xaaaaaea1d3d0) at /nfs-ganesha/src/libntirpc/src/svc_rqst.c:1585
 13 0x0000fffff7f9b10c in work_pool_thread (arg=0xffffcc0008e0) at /nfs-ganesha/src/libntirpc/src/work_pool.c:187
 14 0x0000fffff78de904 in start_thread (arg=0xfffff280dd97) at pthread_create.c:442
 15 0x0000fffff794329c in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:79
(gdb) frame 3
408       convert_from_handle<GaugeInt>(handle)->Increment(value);
(gdb) p metrics
$1 = {clients = {{metric = 0x0}, {metric = 0x0}, {metric = 0x0}, {metric = 0x0}}, connection_started_latencies = {{metric = 0x0}, {metric = 0x0}}, drain_local_client_latencies = {{metric = 0x0}, {metric = 0x0}, {metric = 0x0}, {metric = 0x0}}}

Version-Release number of selected component (if applicable):

Ganesha V6.0


How reproducible:

On any start up


Steps to Reproduce:
1. Start Ganesha with Prometheus metrics enabled
2.
3.

Actual results:

Crash


Expected results:

No crash


Additional info: