update procstat readme

plugins/procstat/README.md

@@ -1,7 +1,9 @@
-# Procstat plugin
+# Telegraf plugin: procstat
+
+#### Description
 
 The procstat plugin can be used to monitor system resource usage by an
-individual process.
+individual process using their /proc data.
 
 Processes can be specified either by pid file or by executable name. Procstat
 plugin will use `pgrep` when executable name is provided to obtain the pid. Proctsta plugin will transmit IO, memory, cpu, file descriptor related measurements for every process specified. A prefix can be set to isolate individual process specific measurements.
@@ -19,3 +21,37 @@ Example:
   pid_file = "/var/run/lxc/dnsmasq.pid"
   prefix = "dnsmasq"
 ```
+
+# Measurements
+Note: prefix will set by the user, per process.
+
+File descriptor related measurement names:
+- procstat_prefix_num_fds value=4
+
+Context switch related measurement names:
+- procstat_prefix_voluntary_context_switches value=250
+- procstat_prefix_involuntary_context_switches value=0
+
+I/O related measurement names:
+- procstat_prefix_read_count value=396
+- procstat_prefix_write_count value=1
+- procstat_prefix_read_bytes value=1019904
+- procstat_prefix_write_bytes value=1
+
+CPU related measurement names:
+- procstat_prefix_cpu_user value=0
+- procstat_prefix_cpu_system value=0.01
+- procstat_prefix_cpu_idle value=0
+- procstat_prefix_cpu_nice value=0
+- procstat_prefix_cpu_iowait value=0
+- procstat_prefix_cpu_irq value=0
+- procstat_prefix_cpu_soft_irq value=0
+- procstat_prefix_cpu_soft_steal value=0
+- procstat_prefix_cpu_soft_stolen value=0
+- procstat_prefix_cpu_soft_guest value=0
+- procstat_prefix_cpu_soft_guest_nice value=0
+
+Memory related measurement names:
+- procstat_prefix_memory_rss value=1777664
+- procstat_prefix_memory_vms value=24227840
+- procstat_prefix_memory_swap value=282624