Adding prometheus dashboard support

Co-authored-by: Todd Gaugler <gauglertodd@gmail.com>
Signed-off-by: Tim Paine <timothy.paine@cubistsystematic.com>

Adding prometheus dashboard support

Co-authored-by: Todd Gaugler <gauglertodd@gmail.com>
Signed-off-by: Tim Paine <timothy.paine@cubistsystematic.com>

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Author: timkpaine

raydar/task_tracker/task_tracker.py

@@ -1,16 +1,21 @@
 import asyncio
 import coolname
+import datetime
 import itertools
 import logging
 import os
 import pandas as pd
 import polars as pl
 import ray
-from collections.abc import Iterable
+import re
+import requests
+import time
+from collections import defaultdict
+from dataclasses import dataclass
 from packaging.version import Version
 from ray.serve import shutdown
 from ray.serve.handle import DeploymentHandle
-from typing import Dict, List, Optional
+from typing import Dict, Iterable, List, Optional
 
 from .schema import schema as default_schema
 
@@ -89,6 +94,7 @@ def __init__(
         namespace: str,
         path: Optional[str] = None,
         enable_perspective_dashboard: bool = False,
+        scrape_prometheus_metrics: bool = False,
     ):
         """An async Ray Actor Class to track task level metadata.
 
@@ -166,6 +172,98 @@ def __init__(
                     "error_message": "str",
                 },
             )
+            if scrape_prometheus_metrics:
+                self.__scraping_job = self.scrape_prometheus_metrics()
+
+    def scrape_prometheus_metrics(self):
+        """
+        Provide a heper method to parse perspective style metrics, a helper dataclass, and launch a job which indefinitely
+        scrapes the NodeManagerAddress:MetricsExportPort/metrics and updates the appropriate perspective tables with metric values.
+        """
+        from prometheus_client.openmetrics import parser
+
+        @dataclass
+        class ParsedOpenMetricsData:
+            metric_name: str
+            metric_description: str
+            metric_type: str
+            metric_value: str
+            metric_metadata: str
+
+        def _parse_response(text):
+            parsed_data = []
+            metric_name = None
+            metric_description = None
+            for line in text.split("\n"):
+                if len(line) > 0:
+                    if line.startswith("# HELP "):
+                        metric_description = " ".join(line.split(" ")[3:])
+                    elif line.startswith("# TYPE "):
+                        _, _, metric_name, metric_type = line.split(" ")
+                    else:
+                        matches = re.search(r".*\{(.*)\}(.*)", line)
+                        if matches is not None:
+                            metric_metadata, metric_value = matches.groups()
+                            metric_metadata = parser._parse_labels_with_state_machine(metric_metadata)[0]
+                        else:
+                            _, metric_value = line.split(" ")
+                            metric_metadata = dict()
+                        parsed_data.append(
+                            ParsedOpenMetricsData(
+                                metric_name=metric_name,
+                                metric_description=metric_description,
+                                metric_type=metric_type,
+                                metric_value=eval(metric_value),
+                                metric_metadata=metric_metadata,
+                            )
+                        )
+            return parsed_data
+
+        @ray.remote
+        def _scrape_prometheus_metrics():
+            """
+            Refreshing every os.environ.get("RAYDAR_PROMETHEUS_METRICS_REFRESH_INTERVAL_S", 2) seconds, attempt to connect to the
+            NodeManagerAddress:MetricsExportPort/metrics endpoint and parse the prometheus metrics provided by this endpoint.
+            Publish the parsed metrics to the appropriate perspective table (tables are created based on metrics_name).
+            """
+            metrics = set()
+            while True:
+                time.sleep(int(os.environ.get("RAYDAR_PROMETHEUS_METRICS_REFRESH_INTERVAL_S", 2)))
+                for node in ray.nodes():
+                    all_values = defaultdict(list)
+                    if node.get("Alive", False):
+                        response = requests.get(f"http://{node.get('NodeManagerAddress')}:{node.get('MetricsExportPort')}/metrics")
+                        if response.status_code == 200:
+                            parsed_values = _parse_response(response.text)
+                            for parsed_value in parsed_values:
+                                data = dict(
+                                    metric_name=parsed_value.metric_name,
+                                    metric_description=parsed_value.metric_description,
+                                    metric_type=parsed_value.metric_type,
+                                    metric_value=parsed_value.metric_value,
+                                    timestamp=datetime.datetime.now(),
+                                )
+                                for key, value in parsed_value.metric_metadata.items():
+                                    data[key] = value
+                                all_values[parsed_value.metric_name].append(data)
+
+                for key, values in all_values.items():
+                    if key not in metrics:
+                        metrics.add(key)
+                        self.proxy_server.remote("new", key, values)
+                    else:
+                        self.proxy_server.remote("update", key, values)
+
+        return _scrape_prometheus_metrics.remote()
+
+    def get_proxy_server(self):
+        """A getter for this actors proxy server attribute. Can be used to create custom perspective visuals.
+
+        Returns: this actor's proxy_server attribute
+        """
+        if self.proxy_server:
+            return self.proxy_server
+        raise Exception("This task_tracker has no active proxy_server.")
 
     def callback(self, tasks: Iterable[ray.ObjectRef]) -> None:
         """A remote function used by this actor's processor actor attribute. Will be called by a separate actor
@@ -218,7 +316,9 @@ def update_perspective_dashboard(self, completed_tasks) -> None:
         That proxy_server serves perspective tables which anticipate the data formats we provide.
 
         Args:
-            completed_tasks: A list of tuples of the form (ObjectReference, TaskMetadata), where the ObjectReferences are neither Running nor Pending Assignment.
+            completed_tasks: A list of tuples of the form (ObjectReference, TaskMetadata), where the
+                             ObjectReferences are neither Running nor Pending Assignment.
+
         """
         data = [
             dict(
@@ -297,14 +397,6 @@ def get_df(self) -> pl.DataFrame:
         )
         return self.df
 
-    def get_proxy_server(self) -> ray.serve.handle.DeploymentHandle:
-        """A getter for this actors proxy server attribute. Can be used to create custom perspective visuals.
-        Returns: this actors proxy_server attribute
-        """
-        if self.proxy_server:
-            return self.proxy_server
-        raise Exception("This task_tracker has no active proxy_server.")
-
     def save_df(self) -> None:
         """Saves the internally maintained dataframe of task related information from the ray GCS"""
         self.get_df()
@@ -323,7 +415,7 @@ def clear_df(self) -> None:
 
 
 class RayTaskTracker:
-    def __init__(self, name: str = "task_tracker", namespace: str = None, **kwargs):
+    def __init__(self, name: Optional[str] = "task_tracker", namespace: Optional[str] = None, **kwargs):
         """A utility to construct AsyncMetadataTracker actors.
 
         Wraps several remote AsyncMetadataTracker functions in a ray.get() call for convenience.
@@ -362,11 +454,11 @@ def get_df(self, process_user_metadata_column=False) -> pl.DataFrame:
             return df_with_user_metadata
         return df
 
-    def save_df(self) -> None:
+    def save_df(self):
         """Save the dataframe used by this object's AsyncMetadataTracker actor"""
         return ray.get(self.tracker.save_df.remote())
 
-    def clear(self) -> None:
+    def clear(self):
         """Clear the dataframe used by this object's AsyncMetadataTracker actor"""
         return ray.get(self.tracker.clear_df.remote())
 

raydar/tests/test_task_tracker.py

@@ -22,6 +22,7 @@ def test_construction_and_dataframe(self):
         time.sleep(30)
         df = task_tracker.get_df()
         assert df[["name", "state"]].row(0) == ("do_some_work", "FINISHED")
+        task_tracker.exit()
 
     def test_get_proxy_server(self):
         from raydar.dashboard.server import PerspectiveRayServer
@@ -37,4 +38,19 @@ def test_get_proxy_server(self):
         server.remote("update", "test_table", [dict(a="foo", b=1, c=1.0, d=time.time())])
         time.sleep(2)
         response = requests.get("http://localhost:8000/tables")
-        assert eval(response.text) == ["test_table"]
+        tables = eval(response.text)
+        assert "test_table" in tables
+
+    def test_scrape_prometheus_metrics(self):
+        task_tracker = RayTaskTracker(
+            enable_perspective_dashboard=True,
+            scrape_prometheus_metrics=True,
+        )
+        time.sleep(30)
+        response = requests.get("http://localhost:8000/tables")
+        tables = eval(response.text)
+        assert len(tables) > 100
+        assert "ray_tasks" in tables
+        assert "ray_actors" in tables
+        assert "ray_resources" in tables
+        task_tracker.exit()