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Fix _exposition.py to stop stripping samples

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Our hacked-up `_exposition.py` was stripping out some samples it shouldn't
have been. Put them back in, to more closely match the upstream
`exposition.py`.
This commit is contained in:
Richard van der Hoff 2020-09-30 16:44:10 +01:00
parent ceafb5a1c6
commit 1c8ca2c543
1 changed files with 29 additions and 11 deletions
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40
synapse/metrics/_exposition.py
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@ -26,6 +26,7 @@ import math
import threading
from http.server import BaseHTTPRequestHandler, HTTPServer
from socketserver import ThreadingMixIn
from typing import Dict, List
from urllib.parse import parse_qs, urlparse
from prometheus_client import REGISTRY
@ -124,16 +125,33 @@ def generate_latest(registry, emit_help=False):
)
)
output.append("# TYPE {0} {1}\n".format(mname, mtype))
for sample in metric.samples:
# Get rid of the OpenMetrics specific samples
om_samples = {} # type: Dict[str, List[str]]
for s in metric.samples:
for suffix in ["_created", "_gsum", "_gcount"]:
if sample.name.endswith(suffix):
if s.name == metric.name + suffix:
# OpenMetrics specific sample, put in a gauge at the end.
# (these come from gaugehistograms which don't get renamed,
# so no need to faff with mnewname)
om_samples.setdefault(suffix, []).append(sample_line(s, s.name))
break
else:
newname = sample.name.replace(mnewname, mname)
newname = s.name.replace(mnewname, mname)
if ":" in newname and newname.endswith("_total"):
newname = newname[: -len("_total")]
output.append(sample_line(sample, newname))
output.append(sample_line(s, newname))
for suffix, lines in sorted(om_samples.items()):
if emit_help:
output.append(
"# HELP {0}{1} {2}\n".format(
metric.name,
suffix,
metric.documentation.replace("\\", r"\\").replace("\n", r"\n"),
)
)
output.append("# TYPE {0}{1} gauge\n".format(metric.name, suffix))
output.extend(lines)
# Get rid of the weird colon things while we're at it
if mtype == "counter":
@ -152,16 +170,16 @@ def generate_latest(registry, emit_help=False):
)
)
output.append("# TYPE {0} {1}\n".format(mnewname, mtype))
for sample in metric.samples:
# Get rid of the OpenMetrics specific samples
for s in metric.samples:
# Get rid of the OpenMetrics specific samples (we should already have
# dealt with them above anyway.)
for suffix in ["_created", "_gsum", "_gcount"]:
if sample.name.endswith(suffix):
if s.name == metric.name + suffix:
break
else:
output.append(
sample_line(
sample, sample.name.replace(":total", "").replace(":", "_")
)
sample_line(s, s.name.replace(":total", "").replace(":", "_"))
)
return "".join(output).encode("utf-8")