logind provides a nice interface to find out about the numbers of sessions
on a system; it is used on most Linux distributions, even those which
aren't using systemd.
The exporter exposes the total number of sessions indexed by the following
attributes:
* seat
* type ("tty", "x11", ...)
* class ("user", "greeter", ...)
* remote ("true"/"false")
This removes the requirement to run `node_exporter` as root or with read
access to `/dev/kmem` in order to get CPU usage statistics.
Once FreeBSD adds a macro for the `kern.cp_times` sysctl, the
`setupSysctlMIBs()` function should be replaced by usage of the macro.
When compiling `20ecedd0b4c983bd7b88f97cd7a21461988a6c12` with GNU make (`gmake`) on FreeBSD 10.2-RELEASE, I get the following error:
```
collector/filesystem_bsd.go:60: non-bool mnt[i].f_flags & MNT_RDONLY (type C.uint64_t) used as if condition
Makefile.COMMON:85: recipe for target 'node_exporter' failed
gmake: *** [node_exporter] Error 2
```
This problem is fixed by this patch.
It turns out, on some kernels (notably - CentOS6) there is an empty line
inserted at the beginning of /sys/devices/system/node/node*/meminfo
files. The leads to node_exporter crash on such kernels.
Fix this by checking for empty string first.
Signed-off-by: Pavel Borzenkov <pavel.borzenkov@gmail.com>
Add new collector which exposes the content of /sys/kernel/mm/ksm
directory. This directory contains control and statistics files for
Kernel Samepage Merging daemon.
The collector is not enabled by default.
Signed-off-by: Pavel Borzenkov <pavel.borzenkov@gmail.com>
Entry collector uses readUintFromFile() function which is defined by
conntrack collector. Thus, it is impossible to build node_exporter w/o
conntrack collector. Fix this by factoring out the function into
helper.go file.
Signed-off-by: Pavel Borzenkov <pavel.borzenkov@gmail.com>
It is sometimes useful to understand the distribution of free/occupied
memory between NUMA nodes to deal with performance problems. To do so,
add new meminfo_numa collector that enables exporting of per node
statistics along with unit and end-to-end tests for it.
Signed-off-by: Pavel Borzenkov <pavel.borzenkov@gmail.com>
Removes unused signal handlers left over from signal based collection
and block the non windows-relevant collectors loadavg and interrupts.
Signal based collection removed in 1c17481a42.
As OS X doesn't have it's own interrupts provider, don't build
interrupts_common on OS X as well. Otherwise build fails, because
interrupts_common depends on variables provided by platform-specific
files.
Signed-off-by: Pavel Borzenkov <pavel.borzenkov@gmail.com>
