Adding prometheus endpoint in tron

requirements-minimal.txt

@@ -10,6 +10,7 @@ ipython
 Jinja2>=3.1.2
 lockfile
 moto
+prometheus-client==0.20.0
 psutil
 py-bcrypt
 pyasn1

requirements.txt

@@ -51,6 +51,7 @@ oauthlib==3.1.0
 parso==0.7.0
 pexpect==4.7.0
 pickleshare==0.7.5
+prometheus-client==0.20.0
 prompt-toolkit==3.0.38
 psutil==5.6.6
 ptyprocess==0.6.0

tests/api/resource_test.py

@@ -169,6 +169,7 @@ def test__init__(self):
             b"metrics",
             b"status",
             b"events",
+            b"prom-metrics",
             b"",
         ]
         assert set(expected_children) == set(self.resource.children)

tron/api/resource.py

@@ -8,6 +8,7 @@
 import traceback
 
 import staticconf
+from prometheus_client.twisted import MetricsResource as MetricsResourceProm
 
 from tron.config.static_config import get_config_watcher
 from tron.config.static_config import NAMESPACE
@@ -500,6 +501,7 @@ def __init__(self, mcp):
         self.putChild(b"status", StatusResource(mcp))
         self.putChild(b"events", EventsResource())
         self.putChild(b"metrics", MetricsResource())
+        self.putChild(b"prom-metrics", MetricsResourceProm())
         self.putChild(b"", self)
 
     @AsyncResource.bounded

tron/kubernetes.py

@@ -15,6 +15,7 @@
 from twisted.internet.defer import logError
 
 import tron.metrics as metrics
+import tron.prom_metrics as prom_metrics
 from tron import __version__
 from tron.actioncommand import ActionCommand
 from tron.config.schema import ConfigFieldSelectorSource
@@ -90,7 +91,13 @@ def report_resources(self, decrement: bool = False) -> None:
         Update internal resource utilization statistics of all tronjobs running for this task's Tron master.
         """
         # TODO(TRON-1612): these should eventually be Prometheus metrics
+        # these should be replaced with gauges in prometheus
         multiplier = -1 if decrement else 1
+        # prometheus gauges
+        prom_metrics.tron_cpu_gauge.inc(self.task_config.cpus * multiplier)
+        prom_metrics.tron_memory_gauge.inc(self.task_config.memory * multiplier)
+        prom_metrics.tron_disk_gauge.inc(self.task_config.disk * multiplier)
+
         metrics.count("tron.mesos.cpus", self.task_config.cpus * multiplier)
         metrics.count("tron.mesos.mem", self.task_config.memory * multiplier)
         metrics.count("tron.mesos.disk", self.task_config.disk * multiplier)

tron/prom_metrics.py

@@ -0,0 +1,6 @@
+from prometheus_client import Gauge
+
+
+tron_cpu_gauge = Gauge("tron.k8s.cpus")
+tron_memory_gauge = Gauge("tron.k8s.mem")
+tron_disk_gauge = Gauge("tron.k8s.disk")