Add more "core" Linux metrics

checks.d/linux_proc_extras.py

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+# project
+from checks import AgentCheck
+from utils.subprocess_output import get_subprocess_output
+from collections import Counter
+
+PROCESS_STATES = {
+    'D': 'uninterruptible',
+    'R': 'runnable',
+    'S': 'sleeping',
+    'T': 'stopped',
+    'W': 'paging',
+    'X': 'dead',
+    'Z': 'zombie',
+}
+
+PROCESS_PRIOS = {
+    '<': 'high',
+    'N': 'low',
+    'L': 'locked'
+}
+
+class MoreUnixCheck(AgentCheck):
+    def check(self, instance):
+        tags = instance.get('tags', [])
+
+        state_counts = Counter()
+
+        prio_counts = Counter()
+
+        with open('/proc/sys/fs/inode-nr', 'r') as inode_info:
+            inode_stats = inode_info.readline().split()
+            self.gauge('system.inodes.total', float(inode_stats[0]), tags=tags)
+            self.gauge('system.inodes.used', float(inode_stats[1]), tags=tags)
+
+        with open('/proc/stat', 'r') as stat_info:
+            lines = [line.strip() for line in stat_info.readlines()]
+
+            for line in lines:
+                if line.startswith('ctxt'):
+                    ctxt_count = float(line.split(' ')[1])
+                    self.monotonic_count('system.linux.context_switches', ctxt_count, tags=tags)
+                elif line.startswith('processes'):
+                    process_count = int(line.split(' ')[1])
+                    self.monotonic_count('system.linux.processes_created', process_count, tags=tags)
+                elif line.startswith('intr'):
+                    interrupts = int(line.split(' ')[1])
+                    self.monotonic_count('system.linux.interrupts', interrupts, tags=tags)
+
+        with open('/proc/sys/kernel/random/entropy_avail') as entropy_info:
+            entropy = entropy_info.readline()
+            self.gauge('system.entropy.available', float(entropy), tags=tags)
+
+        ps = get_subprocess_output(['ps', '--no-header', '-eo', 'stat'], self.log)
+        for state in ps[0]:
+            # Each process state is a flag in a list of characters. See ps(1) for details.
+            for flag in list(state):
+                if state in PROCESS_STATES:
+                    state_counts[PROCESS_STATES[state]] += 1
+                elif state in PROCESS_PRIOS:
+                    prio_counts[PROCESS_PRIOS[state]] += 1
+
+        for state in state_counts:
+            state_tags = list(tags)
+            state_tags.append("state:" + state)
+            self.gauge('system.processes.states', float(state_counts[state]), state_tags)
+
+        for prio in prio_counts:
+            prio_tags = list(tags)
+            prio_tags.append("priority:" + prio)
+            self.gauge('system.processes.priorities', float(prio_counts[prio]), prio_tags)

conf.d/linux_proc_extras.yaml.example

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+# There's no configuration necessary for this check.
+init_config:
+
+instances:
+  - tags: []