Merge pull request #781 from opendatacube/histogram_metric

Upgrade OGC metrics to histogram. Update History.rst.

Author: SpacemanPaul

HISTORY.rst

@@ -7,7 +7,14 @@ History
 
 Datacube-ows version 1.8.x indicates that it is designed work with datacube-core versions 1.8.x.
 
-1.8.23.2 (2021-12-16)
+1.8.23.3 (2021-12-16)
+---------------------
+
+Interim administrative release.
+
+* Upgraded Prometheus metrics to histogram type, and updated HISTORY.rst (#781)
+
+1.8.23.2 (2021-12-15)
 ---------------------
 
 Interim administrative release.

datacube_ows/ogc.py

@@ -47,7 +47,7 @@
 OWS_SUPPORTED = supported_versions()
 
 # Prometheus Metrics
-prometheus_ows_ogc_metric = metrics.summary(
+prometheus_ows_ogc_metric = metrics.histogram(
     "ows_ogc",
     "Summary by OGC request protocol, version, operation, layer, and HTTP Status",
     labels={
@@ -196,7 +196,7 @@ def ping():
 
 
 @app.route("/legend/<string:layer>/<string:style>/legend.png")
-@metrics.summary('ows_legends', "Legend query durations", labels={
+@metrics.histogram('ows_legends', "Legend query durations", labels={
     "layer": lambda: request.path.split("/")[2],
     "style": lambda: request.path.split("/")[3],
     "status": lambda r: r.status,