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NFS Client input plugin README cleanup (#8943) 

* NFS Client input plugin README cleanup

* reorder
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plugins/inputs/nfsclient/README.md
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@ -1,20 +1,11 @@
#### Description
# NFS Client Input Plugin
The NFSClient plugin collects data from /proc/self/mountstats. By default, only a limited number of general system-level metrics are collected, including basic read/write counts.
The NFS Client input plugin collects data from /proc/self/mountstats. By default, only a limited number of general system-level metrics are collected, including basic read/write counts.
If `fullstat` is set, a great deal of additional metrics are collected, detailed below.
**NOTE** Many of the metrics, even if tagged with a mount point, are really _per-server_. Thus, if you mount these two shares: `nfs01:/vol/foo/bar` and `nfs01:/vol/foo/baz`, there will be two near identical entries in /proc/self/mountstats. This is a limitation of the metrics exposed by the kernel, not the telegraf plugin.
#### Plugin arguments:
- **fullstat** bool: Collect per-operation type metrics. Defaults to false.
- **include_mounts** list(string): gather metrics for only these mounts. Default is to watch all mounts.
- **exclude_mounts** list(string): gather metrics for all mounts, except those listed in this option. Excludes take precedence over includes.
- **include_operations** list(string): List of specific NFS operations to track. See /proc/self/mountstats (the "per-op statistics" section) for complete lists of valid options for NFSv3 and NFSV4. The default is to gather all metrics, but this is almost certainly *not* what you want (there are 22 operations for NFSv3, and well over 50 for NFSv4). A suggested 'minimal' list of operations to collect for basic usage: `['READ','WRITE','ACCESS','GETATTR','READDIR','LOOKUP','LOOKUP']`
- **exclude_operations** list(string): Gather all metrics, except those listed. Excludes take precedence over includes.
*N.B.* the `include_mounts` and `exclude_mounts` arguments are both applied to the local mount location (e.g. /mnt/NFS), not the server export (e.g. nfsserver:/vol/NFS). Go regexp patterns can be used in either.
#### Examples
### Configuration
```toml
[[inputs.nfsclient]]
@ -44,28 +35,14 @@ If `fullstat` is set, a great deal of additional metrics are collected, detailed
# include_operations = []
# exclude_operations = []
```
#### Configuration Options
- **fullstat** bool: Collect per-operation type metrics. Defaults to false.
- **include_mounts** list(string): gather metrics for only these mounts. Default is to watch all mounts.
- **exclude_mounts** list(string): gather metrics for all mounts, except those listed in this option. Excludes take precedence over includes.
- **include_operations** list(string): List of specific NFS operations to track. See /proc/self/mountstats (the "per-op statistics" section) for complete lists of valid options for NFSv3 and NFSV4. The default is to gather all metrics, but this is almost certainly *not* what you want (there are 22 operations for NFSv3, and well over 50 for NFSv4). A suggested 'minimal' list of operations to collect for basic usage: `['READ','WRITE','ACCESS','GETATTR','READDIR','LOOKUP','LOOKUP']`
- **exclude_operations** list(string): Gather all metrics, except those listed. Excludes take precedence over includes.
Example output for basic metrics showing server-wise read and write data:
```
nfsstat,mountpoint=/NFS,operation=READ,serverexport=1.2.3.4:/storage/NFS ops=600i,retrans=1i,bytes=1207i,rtt=606i,exe=607i 1612651512000000000
nfsstat,mountpoint=/NFS,operation=WRITE,serverexport=1.2.3.4:/storage/NFS bytes=1407i,rtt=706i,exe=707i,ops=700i,retrans=1i 1612651512000000000
```
Example output for `fullstat=true` metrics, which includes additional measurements for `nfs_bytes`, `nfs_events`, and `nfs_xprt_tcp` (and `nfs_xprt_udp` if present).
Additionally, per-OP metrics are collected, with examples for READ, LOOKUP, and NULL shown.
Please refer to `/proc/self/mountstats` for a list of supported NFS operations, as it changes as it changes periodically.
```
nfs_bytes,mountpoint=/home,serverexport=nfs01:/vol/home directreadbytes=0i,directwritebytes=0i,normalreadbytes=42648757667i,normalwritebytes=0i,readpages=10404603i,serverreadbytes=42617098139i,serverwritebytes=0i,writepages=0i 1608787697000000000
nfs_events,mountpoint=/home,serverexport=nfs01:/vol/home attrinvalidates=116i,congestionwait=0i,datainvalidates=65i,delay=0i,dentryrevalidates=5911243i,extendwrite=0i,inoderevalidates=200378i,pnfsreads=0i,pnfswrites=0i,setattrtrunc=0i,shortreads=0i,shortwrites=0i,sillyrenames=0i,vfsaccess=7203852i,vfsflush=117405i,vfsfsync=0i,vfsgetdents=3368i,vfslock=0i,vfslookup=740i,vfsopen=157281i,vfsreadpage=16i,vfsreadpages=86874i,vfsrelease=155526i,vfssetattr=0i,vfsupdatepage=0i,vfswritepage=0i,vfswritepages=215514i 1608787697000000000
nfs_xprt_tcp,mountpoint=/home,serverexport=nfs01:/vol/home backlogutil=0i,badxids=0i,bind_count=1i,connect_count=1i,connect_time=0i,idle_time=0i,inflightsends=15659826i,rpcreceives=2173896i,rpcsends=2173896i 1608787697000000000
nfs_ops,mountpoint=/NFS,operation=NULL,serverexport=1.2.3.4:/storage/NFS trans=0i,timeouts=0i,bytes_sent=0i,bytes_recv=0i,queue_time=0i,response_time=0i,total_time=0i,ops=0i 1612651512000000000
nfs_ops,mountpoint=/NFS,operation=READ,serverexport=1.2.3.4:/storage/NFS bytes=1207i,timeouts=602i,total_time=607i,exe=607i,trans=601i,bytes_sent=603i,bytes_recv=604i,queue_time=605i,ops=600i,retrans=1i,rtt=606i,response_time=606i 1612651512000000000
nfs_ops,mountpoint=/NFS,operation=WRITE,serverexport=1.2.3.4:/storage/NFS ops=700i,bytes=1407i,exe=707i,trans=701i,timeouts=702i,response_time=706i,total_time=707i,retrans=1i,rtt=706i,bytes_sent=703i,bytes_recv=704i,queue_time=705i 1612651512000000000
```
*N.B.* the `include_mounts` and `exclude_mounts` arguments are both applied to the local mount location (e.g. /mnt/NFS), not the server export (e.g. nfsserver:/vol/NFS). Go regexp patterns can be used in either.
#### References
1. [nfsiostat](http://git.linux-nfs.org/?p=steved/nfs-utils.git;a=summary)
@ -75,9 +52,9 @@ nfs_ops,mountpoint=/NFS,operation=WRITE,serverexport=1.2.3.4:/storage/NFS ops=70
#### Measurements & Fields
### Metrics
Always collected:
#### Fields
- nfsstat
- bytes (integer, bytes) - The total number of bytes exchanged doing this operation. This is bytes sent *and* received, including overhead *and* payload. (bytes = OP_bytes_sent + OP_bytes_recv. See nfs_ops below)
@ -111,57 +88,56 @@ Please refer to `/proc/self/mountstats` for a list of supported NFS operations,
- nfs_bytes
- fields:
- normalreadbytes - (int, bytes) - Bytes read from the server via `read()`
- normalwritebytes - (int, bytes) - Bytes written to the server via `write()`
- directreadbytes - (int, bytes) - Bytes read with O_DIRECT set
- directwritebytes - (int, bytes) -Bytes written with O_DIRECT set
- serverreadbytes - (int, bytes) - Bytes read via NFS READ (via `mmap()`)
- serverwritebytes - (int, bytes) - Bytes written via NFS WRITE (via `mmap()`)
- readpages - (int, count) - Number of pages read
- writepages - (int, count) - Number of pages written
- normalreadbytes (int, bytes): Bytes read from the server via `read()`
- normalwritebytes (int, bytes): Bytes written to the server via `write()`
- directreadbytes (int, bytes): Bytes read with O_DIRECT set
- directwritebytes (int, bytes): Bytes written with O_DIRECT set
- serverreadbytes (int, bytes): Bytes read via NFS READ (via `mmap()`)
- serverwritebytes (int, bytes): Bytes written via NFS WRITE (via `mmap()`)
- readpages (int, count): Number of pages read
- writepages (int, count): Number of pages written
- nfs_events - Per-event metrics
- nfs_events (Per-event metrics)
- fields:
- inoderevalidates - (int, count) - How many times cached inode attributes have to be re-validated from the server.
- dentryrevalidates - (int, count) - How many times cached dentry nodes have to be re-validated.
- datainvalidates - (int, count) - How many times an inode had its cached data thrown out.
- attrinvalidates - (int, count) - How many times an inode has had cached inode attributes invalidated.
- vfsopen - (int, count) - How many times files or directories have been `open()`'d.
- vfslookup - (int, count) - How many name lookups in directories there have been.
- vfsaccess - (int, count) - Number of calls to `access()`. (formerly called "vfspermission")
- inoderevalidates (int, count): How many times cached inode attributes have to be re-validated from the server.
- dentryrevalidates (int, count): How many times cached dentry nodes have to be re-validated.
- datainvalidates (int, count): How many times an inode had its cached data thrown out.
- attrinvalidates (int, count): How many times an inode has had cached inode attributes invalidated.
- vfsopen (int, count): How many times files or directories have been `open()`'d.
- vfslookup (int, count): How many name lookups in directories there have been.
- vfsaccess (int, count): Number of calls to `access()`. (formerly called "vfspermission")
- vfsupdatepage (int, count): Count of updates (and potential writes) to pages.
- vfsreadpage (int, count): Number of pages read.
- vfsreadpages (int, count): Count of how many times a _group_ of pages was read (possibly via `mmap()`?).
- vfswritepage (int, count): Number of pages written.
- vfswritepages (int, count): Count of how many times a _group_ of pages was written (possibly via `mmap()`?)
- vfsgetdents (int, count): Count of directory entry reads with getdents(). These reads can be served from cache and don't necessarily imply actual NFS requests. (formerly called "vfsreaddir")
- vfssetattr (int, count): How many times we've set attributes on inodes.
- vfsflush (int, count): Count of times pending writes have been forcibly flushed to the server.
- vfsfsync (int, count): Count of calls to `fsync()` on directories and files.
- vfslock (int, count): Number of times a lock was attempted on a file (regardless of success or not).
- vfsrelease (int, count): Number of calls to `close()`.
- congestionwait (int, count): Believe unused by the Linux kernel, but it is part of the NFS spec.
- setattrtrunc (int, count): How many times files have had their size truncated.
- extendwrite (int, count): How many times a file has been grown because you're writing beyond the existing end of the file.
- sillyrenames (int, count): Number of times an in-use file was removed (thus creating a temporary ".nfsXXXXXX" file)
- shortreads (int, count): Number of times the NFS server returned less data than requested.
- shortwrites (int, count): Number of times NFS server reports it wrote less data than requested.
- delay (int, count): Occurances of EJUKEBOX ("Jukebox Delay", probably unused)
- pnfsreads (int, count): Count of NFS v4.1+ pNFS reads.
- pnfswrites (int, count): Count of NFS v4.1+ pNFS writes.
- vfsupdatepage - (int, count) - Count of updates (and potential writes) to pages.
- vfsreadpage - (int, count) - Number of pages read.
- vfsreadpages - (int, count) - Count of how many times a _group_ of pages was read (possibly via `mmap()`?).
- vfswritepage - (int, count) - Number of pages written.
- vfswritepages - (int, count) - Count of how many times a _group_ of pages was written (possibly via `mmap()`?)
- vfsgetdents - (int, count) - Count of directory entry reads with getdents(). These reads can be served from cache and don't necessarily imply actual NFS requests. (formerly called "vfsreaddir")
- vfssetattr - (int, count) - How many times we've set attributes on inodes.
- vfsflush - (int, count) - Count of times pending writes have been forcibly flushed to the server.
- vfsfsync - (int, count) - Count of calls to `fsync()` on directories and files.
- vfslock - (int, count) - Number of times a lock was attempted on a file (regardless of success or not).
- vfsrelease - (int, count) - Number of calls to `close()`.
- congestionwait - (int, count) - Believe unused by the Linux kernel, but it is part of the NFS spec.
- setattrtrunc - (int, count) - How many times files have had their size truncated.
- extendwrite - (int, count) - How many times a file has been grown because you're writing beyond the existing end of the file.
- sillyrenames - (int, count) - Number of times an in-use file was removed (thus creating a temporary ".nfsXXXXXX" file)
- shortreads - (int, count) - Number of times the NFS server returned less data than requested.
- shortwrites - (int, count) - Number of times NFS server reports it wrote less data than requested.
- delay - (int, count) - Occurances of EJUKEBOX ("Jukebox Delay", probably unused)
- pnfsreads - (int, count) - Count of NFS v4.1+ pNFS reads.
- pnfswrites - (int, count) - Count of NFS v4.1+ pNFS writes.
- nfs_xprt_tcp
- nfs_xprt_tcp
- fields:
- bind_count - (int, count) - Number of _completely new_ mounts to this server (sometimes 0?)
- connect_count - (int, count) - How many times the client has connected to the server in question
- connect_time - (int, jiffies) - How long the NFS client has spent waiting for its connection(s) to the server to be established.
- idle_time - (int, seconds) - How long (in seconds) since the NFS mount saw any RPC traffic.
- rpcsends - (int, count) - How many RPC requests this mount has sent to the server.
- rpcreceives - (int, count) - How many RPC replies this mount has received from the server.
- badxids - (int, count) - Count of XIDs sent by the server that the client doesn't know about.
- inflightsends - (int, count) - Number of outstanding requests; always >1. (See reference #4 for comment on this field)
- backlogutil - (int, count) - Cumulative backlog count
- bind_count (int, count): Number of _completely new_ mounts to this server (sometimes 0?)
- connect_count (int, count): How many times the client has connected to the server in question
- connect_time (int, jiffies): How long the NFS client has spent waiting for its connection(s) to the server to be established.
- idle_time (int, seconds): How long (in seconds) since the NFS mount saw any RPC traffic.
- rpcsends (int, count): How many RPC requests this mount has sent to the server.
- rpcreceives (int, count): How many RPC replies this mount has received from the server.
- badxids (int, count): Count of XIDs sent by the server that the client doesn't know about.
- inflightsends (int, count): Number of outstanding requests; always >1. (See reference #4 for comment on this field)
- backlogutil (int, count): Cumulative backlog count
- nfs_xprt_udp
- fields:
@ -169,13 +145,37 @@ Please refer to `/proc/self/mountstats` for a list of supported NFS operations,
- nfs_ops
- fields (In all cases, the `operations` tag is set to the uppercase name of the NFS operation, _e.g._ "READ", "FSINFO", _etc_. See /proc/self/mountstats for a full list):
- ops - (int, count) - Total operations of this type.
- trans - (int, count) - Total transmissions of this type, including retransmissions: `OP_ops - OP_trans = total_retransmissions` (lower is better).
- timeouts - (int, count) - Number of major timeouts.
- bytes_sent - (int, count) - Bytes received, including headers (should also be close to on-wire size).
- bytes_recv - (int, count) - Bytes sent, including headers (should be close to on-wire size).
- queue_time - (int, milliseconds) - Cumulative time a request waited in the queue before sending this OP type.
- response_time - (int, milliseconds) - Cumulative time waiting for a response for this OP type.
- total_time - (int, milliseconds) - Cumulative time a request waited in the queue before sending.
- errors - (int, count) - Total number operations that complete with tk_status < 0 (usually errors). This is a new field, present in kernel >=5.3, mountstats version 1.1
- ops (int, count): Total operations of this type.
- trans (int, count): Total transmissions of this type, including retransmissions: `OP_ops - OP_trans = total_retransmissions` (lower is better).
- timeouts (int, count): Number of major timeouts.
- bytes_sent (int, count): Bytes received, including headers (should also be close to on-wire size).
- bytes_recv (int, count): Bytes sent, including headers (should be close to on-wire size).
- queue_time (int, milliseconds): Cumulative time a request waited in the queue before sending this OP type.
- response_time (int, milliseconds): Cumulative time waiting for a response for this OP type.
- total_time (int, milliseconds): Cumulative time a request waited in the queue before sending.
- errors (int, count): Total number operations that complete with tk_status < 0 (usually errors). This is a new field, present in kernel >=5.3, mountstats version 1.1
### Example Output
For basic metrics showing server-wise read and write data.
```
nfsstat,mountpoint=/NFS,operation=READ,serverexport=1.2.3.4:/storage/NFS ops=600i,retrans=1i,bytes=1207i,rtt=606i,exe=607i 1612651512000000000
nfsstat,mountpoint=/NFS,operation=WRITE,serverexport=1.2.3.4:/storage/NFS bytes=1407i,rtt=706i,exe=707i,ops=700i,retrans=1i 1612651512000000000
```
For `fullstat=true` metrics, which includes additional measurements for `nfs_bytes`, `nfs_events`, and `nfs_xprt_tcp` (and `nfs_xprt_udp` if present).
Additionally, per-OP metrics are collected, with examples for READ, LOOKUP, and NULL shown.
Please refer to `/proc/self/mountstats` for a list of supported NFS operations, as it changes as it changes periodically.
```
nfs_bytes,mountpoint=/home,serverexport=nfs01:/vol/home directreadbytes=0i,directwritebytes=0i,normalreadbytes=42648757667i,normalwritebytes=0i,readpages=10404603i,serverreadbytes=42617098139i,serverwritebytes=0i,writepages=0i 1608787697000000000
nfs_events,mountpoint=/home,serverexport=nfs01:/vol/home attrinvalidates=116i,congestionwait=0i,datainvalidates=65i,delay=0i,dentryrevalidates=5911243i,extendwrite=0i,inoderevalidates=200378i,pnfsreads=0i,pnfswrites=0i,setattrtrunc=0i,shortreads=0i,shortwrites=0i,sillyrenames=0i,vfsaccess=7203852i,vfsflush=117405i,vfsfsync=0i,vfsgetdents=3368i,vfslock=0i,vfslookup=740i,vfsopen=157281i,vfsreadpage=16i,vfsreadpages=86874i,vfsrelease=155526i,vfssetattr=0i,vfsupdatepage=0i,vfswritepage=0i,vfswritepages=215514i 1608787697000000000
nfs_xprt_tcp,mountpoint=/home,serverexport=nfs01:/vol/home backlogutil=0i,badxids=0i,bind_count=1i,connect_count=1i,connect_time=0i,idle_time=0i,inflightsends=15659826i,rpcreceives=2173896i,rpcsends=2173896i 1608787697000000000
nfs_ops,mountpoint=/NFS,operation=NULL,serverexport=1.2.3.4:/storage/NFS trans=0i,timeouts=0i,bytes_sent=0i,bytes_recv=0i,queue_time=0i,response_time=0i,total_time=0i,ops=0i 1612651512000000000
nfs_ops,mountpoint=/NFS,operation=READ,serverexport=1.2.3.4:/storage/NFS bytes=1207i,timeouts=602i,total_time=607i,exe=607i,trans=601i,bytes_sent=603i,bytes_recv=604i,queue_time=605i,ops=600i,retrans=1i,rtt=606i,response_time=606i 1612651512000000000
nfs_ops,mountpoint=/NFS,operation=WRITE,serverexport=1.2.3.4:/storage/NFS ops=700i,bytes=1407i,exe=707i,trans=701i,timeouts=702i,response_time=706i,total_time=707i,retrans=1i,rtt=706i,bytes_sent=703i,bytes_recv=704i,queue_time=705i 1612651512000000000
```