From d5008893f756211456d2f4a3d37f69c022f11e8d Mon Sep 17 00:00:00 2001
From: Bob Belnap <robert.belnap@uga.edu>
Date: Mon, 1 Aug 2022 09:45:47 -0400
Subject: [PATCH] add basic prometheus metrics with prometheus_flask_exporter

---
 cellxgene_gateway/gateway.py | 5 +++++
 requirements.txt             | 1 +
 2 files changed, 6 insertions(+)

diff --git a/cellxgene_gateway/gateway.py b/cellxgene_gateway/gateway.py
index c930974..dfd7950 100644
--- a/cellxgene_gateway/gateway.py
+++ b/cellxgene_gateway/gateway.py
@@ -23,6 +23,7 @@ from flask import (
     url_for,
 )
 from werkzeug.middleware.proxy_fix import ProxyFix
+from prometheus_flask_exporter import PrometheusMetrics
 
 from cellxgene_gateway import env, flask_util
 from cellxgene_gateway.backend_cache import BackendCache
@@ -34,9 +35,13 @@ from cellxgene_gateway.filecrawl import render_item_source
 from cellxgene_gateway.process_exception import ProcessException
 from cellxgene_gateway.prune_process_cache import PruneProcessCache
 from cellxgene_gateway.util import current_time_stamp
+from cellxgene_gateway import __version__
 
 app = Flask(__name__)
 
+metrics = PrometheusMetrics(app)
+metrics.info('app_info', 'Application info', version=__version__)
+
 item_sources = []
 default_item_source = None
 
diff --git a/requirements.txt b/requirements.txt
index f5f698f..eb22151 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,3 +4,4 @@ flask-api
 werkzeug
 psutil
 requests
+prometheus-flask-exporter