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Remove legacy Prometheus metrics names. They were deprecated in Synapse v1.69.0 and disabled by default in Synapse v1.71.0. (#14538)

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reivilibre 2022-11-24 09:09:17 +00:00 committed by GitHub
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1
changelog.d/14538.removal Normal file
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@ -0,0 +1 @@
Remove legacy Prometheus metrics names. They were deprecated in Synapse v1.69.0 and disabled by default in Synapse v1.71.0.

22
docs/upgrade.md
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@ -88,6 +88,28 @@ process, for example:
dpkg -i matrix-synapse-py3_1.3.0+stretch1_amd64.deb
```
# Upgrading to v1.73.0
## Legacy Prometheus metric names have now been removed
Synapse v1.69.0 included the deprecation of legacy Prometheus metric names
and offered an option to disable them.
Synapse v1.71.0 disabled legacy Prometheus metric names by default.
This version, v1.73.0, removes those legacy Prometheus metric names entirely.
This also means that the `enable_legacy_metrics` configuration option has been
removed; it will no longer be possible to re-enable the legacy metric names.
If you use metrics and have not yet updated your Grafana dashboard(s),
Prometheus console(s) or alerting rule(s), please consider doing so when upgrading
to this version.
Note that the included Grafana dashboard was updated in v1.72.0 to correct some
metric names which were missed when legacy metrics were disabled by default.
See [v1.69.0: Deprecation of legacy Prometheus metric names](#deprecation-of-legacy-prometheus-metric-names)
for more context.
# Upgrading to v1.72.0
## Dropping support for PostgreSQL 10

25
docs/usage/configuration/config_documentation.md
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@ -2437,31 +2437,6 @@ Example configuration:
enable_metrics: true
```
---
### `enable_legacy_metrics`
Set to `true` to publish both legacy and non-legacy Prometheus metric names,
or to `false` to only publish non-legacy Prometheus metric names.
Defaults to `false`. Has no effect if `enable_metrics` is `false`.
**In Synapse v1.67.0 up to and including Synapse v1.70.1, this defaulted to `true`.**
Legacy metric names include:
- metrics containing colons in the name, such as `synapse_util_caches_response_cache:hits`, because colons are supposed to be reserved for user-defined recording rules;
- counters that don't end with the `_total` suffix, such as `synapse_federation_client_sent_edus`, therefore not adhering to the OpenMetrics standard.
These legacy metric names are unconventional and not compliant with OpenMetrics standards.
They are included for backwards compatibility.
Example configuration:
```yaml
enable_legacy_metrics: false
```
See https://github.com/matrix-org/synapse/issues/11106 for context.
*Since v1.67.0.*
**Will be removed in v1.73.0.**
---
### `sentry`
Use this option to enable sentry integration. Provide the DSN assigned to you by sentry

16
synapse/app/_base.py
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@ -266,26 +266,18 @@ def register_start(
reactor.callWhenRunning(lambda: defer.ensureDeferred(wrapper()))
def listen_metrics(
bind_addresses: Iterable[str], port: int, enable_legacy_metric_names: bool
) -> None:
def listen_metrics(bind_addresses: Iterable[str], port: int) -> None:
"""
Start Prometheus metrics server.
"""
from prometheus_client import start_http_server as start_http_server_prometheus
from synapse.metrics import (
RegistryProxy,
start_http_server as start_http_server_legacy,
)
from synapse.metrics import RegistryProxy
for host in bind_addresses:
logger.info("Starting metrics listener on %s:%d", host, port)
if enable_legacy_metric_names:
start_http_server_legacy(port, addr=host, registry=RegistryProxy)
else:
_set_prometheus_client_use_created_metrics(False)
start_http_server_prometheus(port, addr=host, registry=RegistryProxy)
_set_prometheus_client_use_created_metrics(False)
start_http_server_prometheus(port, addr=host, registry=RegistryProxy)
def _set_prometheus_client_use_created_metrics(new_value: bool) -> None:

1
synapse/app/generic_worker.py
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@ -320,7 +320,6 @@ class GenericWorkerServer(HomeServer):
_base.listen_metrics(
listener.bind_addresses,
listener.port,
enable_legacy_metric_names=self.config.metrics.enable_legacy_metrics,
)
else:
logger.warning("Unsupported listener type: %s", listener.type)

1
synapse/app/homeserver.py
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@ -265,7 +265,6 @@ class SynapseHomeServer(HomeServer):
_base.listen_metrics(
listener.bind_addresses,
listener.port,
enable_legacy_metric_names=self.config.metrics.enable_legacy_metrics,
)
else:
# this shouldn't happen, as the listener type should have been checked

2
synapse/config/metrics.py
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@ -43,8 +43,6 @@ class MetricsConfig(Config):
def read_config(self, config: JsonDict, **kwargs: Any) -> None:
self.enable_metrics = config.get("enable_metrics", False)
self.enable_legacy_metrics = config.get("enable_legacy_metrics", False)
self.report_stats = config.get("report_stats", None)
self.report_stats_endpoint = config.get(
"report_stats_endpoint", "https://matrix.org/report-usage-stats/push"

7
synapse/metrics/__init__.py
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@ -47,11 +47,7 @@ from twisted.python.threadpool import ThreadPool
# This module is imported for its side effects; flake8 needn't warn that it's unused.
import synapse.metrics._reactor_metrics # noqa: F401
from synapse.metrics._gc import MIN_TIME_BETWEEN_GCS, install_gc_manager
from synapse.metrics._legacy_exposition import (
MetricsResource,
generate_latest,
start_http_server,
)
from synapse.metrics._twisted_exposition import MetricsResource, generate_latest
from synapse.metrics._types import Collector
from synapse.util import SYNAPSE_VERSION
@ -474,7 +470,6 @@ __all__ = [
"Collector",
"MetricsResource",
"generate_latest",
"start_http_server",
"LaterGauge",
"InFlightGauge",
"GaugeBucketCollector",

288
synapse/metrics/_legacy_exposition.py
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@ -1,288 +0,0 @@
# Copyright 2015-2019 Prometheus Python Client Developers
# Copyright 2019 Matrix.org Foundation C.I.C.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
This code is based off `prometheus_client/exposition.py` from version 0.7.1.
Due to the renaming of metrics in prometheus_client 0.4.0, this customised
vendoring of the code will emit both the old versions that Synapse dashboards
expect, and the newer "best practice" version of the up-to-date official client.
"""
import logging
import math
import threading
from http.server import BaseHTTPRequestHandler, HTTPServer
from socketserver import ThreadingMixIn
from typing import Any, Dict, List, Type, Union
from urllib.parse import parse_qs, urlparse
from prometheus_client import REGISTRY, CollectorRegistry
from prometheus_client.core import Sample
from twisted.web.resource import Resource
from twisted.web.server import Request
logger = logging.getLogger(__name__)
CONTENT_TYPE_LATEST = "text/plain; version=0.0.4; charset=utf-8"
def floatToGoString(d: Union[int, float]) -> str:
d = float(d)
if d == math.inf:
return "+Inf"
elif d == -math.inf:
return "-Inf"
elif math.isnan(d):
return "NaN"
else:
s = repr(d)
dot = s.find(".")
# Go switches to exponents sooner than Python.
# We only need to care about positive values for le/quantile.
if d > 0 and dot > 6:
mantissa = f"{s[0]}.{s[1:dot]}{s[dot + 1 :]}".rstrip("0.")
return f"{mantissa}e+0{dot - 1}"
return s
def sample_line(line: Sample, name: str) -> str:
if line.labels:
labelstr = "{{{0}}}".format(
",".join(
[
'{}="{}"'.format(
k,
v.replace("\\", r"\\").replace("\n", r"\n").replace('"', r"\""),
)
for k, v in sorted(line.labels.items())
]
)
)
else:
labelstr = ""
timestamp = ""
if line.timestamp is not None:
# Convert to milliseconds.
timestamp = f" {int(float(line.timestamp) * 1000):d}"
return "{}{} {}{}\n".format(name, labelstr, floatToGoString(line.value), timestamp)
# Mapping from new metric names to legacy metric names.
# We translate these back to their old names when exposing them through our
# legacy vendored exporter.
# Only this legacy exposition module applies these name changes.
LEGACY_METRIC_NAMES = {
"synapse_util_caches_cache_hits": "synapse_util_caches_cache:hits",
"synapse_util_caches_cache_size": "synapse_util_caches_cache:size",
"synapse_util_caches_cache_evicted_size": "synapse_util_caches_cache:evicted_size",
"synapse_util_caches_cache": "synapse_util_caches_cache:total",
"synapse_util_caches_response_cache_size": "synapse_util_caches_response_cache:size",
"synapse_util_caches_response_cache_hits": "synapse_util_caches_response_cache:hits",
"synapse_util_caches_response_cache_evicted_size": "synapse_util_caches_response_cache:evicted_size",
"synapse_util_caches_response_cache": "synapse_util_caches_response_cache:total",
"synapse_federation_client_sent_pdu_destinations": "synapse_federation_client_sent_pdu_destinations:total",
"synapse_federation_client_sent_pdu_destinations_count": "synapse_federation_client_sent_pdu_destinations:count",
"synapse_admin_mau_current": "synapse_admin_mau:current",
"synapse_admin_mau_max": "synapse_admin_mau:max",
"synapse_admin_mau_registered_reserved_users": "synapse_admin_mau:registered_reserved_users",
}
def generate_latest(registry: CollectorRegistry, emit_help: bool = False) -> bytes:
"""
Generate metrics in legacy format. Modern metrics are generated directly
by prometheus-client.
"""
output = []
for metric in registry.collect():
if not metric.samples:
# No samples, don't bother.
continue
# Translate to legacy metric name if it has one.
mname = LEGACY_METRIC_NAMES.get(metric.name, metric.name)
mnewname = metric.name
mtype = metric.type
# OpenMetrics -> Prometheus
if mtype == "counter":
mnewname = mnewname + "_total"
elif mtype == "info":
mtype = "gauge"
mnewname = mnewname + "_info"
elif mtype == "stateset":
mtype = "gauge"
elif mtype == "gaugehistogram":
mtype = "histogram"
elif mtype == "unknown":
mtype = "untyped"
# Output in the old format for compatibility.
if emit_help:
output.append(
"# HELP {} {}\n".format(
mname,
metric.documentation.replace("\\", r"\\").replace("\n", r"\n"),
)
)
output.append(f"# TYPE {mname} {mtype}\n")
om_samples: Dict[str, List[str]] = {}
for s in metric.samples:
for suffix in ["_created", "_gsum", "_gcount"]:
if s.name == mname + 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 = s.name.replace(mnewname, mname)
if ":" in newname and newname.endswith("_total"):
newname = newname[: -len("_total")]
output.append(sample_line(s, newname))
for suffix, lines in sorted(om_samples.items()):
if emit_help:
output.append(
"# HELP {}{} {}\n".format(
mname,
suffix,
metric.documentation.replace("\\", r"\\").replace("\n", r"\n"),
)
)
output.append(f"# TYPE {mname}{suffix} gauge\n")
output.extend(lines)
# Get rid of the weird colon things while we're at it
if mtype == "counter":
mnewname = mnewname.replace(":total", "")
mnewname = mnewname.replace(":", "_")
if mname == mnewname:
continue
# Also output in the new format, if it's different.
if emit_help:
output.append(
"# HELP {} {}\n".format(
mnewname,
metric.documentation.replace("\\", r"\\").replace("\n", r"\n"),
)
)
output.append(f"# TYPE {mnewname} {mtype}\n")
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 s.name == mname + suffix:
break
else:
sample_name = LEGACY_METRIC_NAMES.get(s.name, s.name)
output.append(
sample_line(s, sample_name.replace(":total", "").replace(":", "_"))
)
return "".join(output).encode("utf-8")
class MetricsHandler(BaseHTTPRequestHandler):
"""HTTP handler that gives metrics from ``REGISTRY``."""
registry = REGISTRY
def do_GET(self) -> None:
registry = self.registry
params = parse_qs(urlparse(self.path).query)
if "help" in params:
emit_help = True
else:
emit_help = False
try:
output = generate_latest(registry, emit_help=emit_help)
except Exception:
self.send_error(500, "error generating metric output")
raise
try:
self.send_response(200)
self.send_header("Content-Type", CONTENT_TYPE_LATEST)
self.send_header("Content-Length", str(len(output)))
self.end_headers()
self.wfile.write(output)
except BrokenPipeError as e:
logger.warning(
"BrokenPipeError when serving metrics (%s). Did Prometheus restart?", e
)
def log_message(self, format: str, *args: Any) -> None:
"""Log nothing."""
@classmethod
def factory(cls, registry: CollectorRegistry) -> Type:
"""Returns a dynamic MetricsHandler class tied
to the passed registry.
"""
# This implementation relies on MetricsHandler.registry
# (defined above and defaulted to REGISTRY).
# As we have unicode_literals, we need to create a str()
# object for type().
cls_name = str(cls.__name__)
MyMetricsHandler = type(cls_name, (cls, object), {"registry": registry})
return MyMetricsHandler
class _ThreadingSimpleServer(ThreadingMixIn, HTTPServer):
"""Thread per request HTTP server."""
# Make worker threads "fire and forget". Beginning with Python 3.7 this
# prevents a memory leak because ``ThreadingMixIn`` starts to gather all
# non-daemon threads in a list in order to join on them at server close.
# Enabling daemon threads virtually makes ``_ThreadingSimpleServer`` the
# same as Python 3.7's ``ThreadingHTTPServer``.
daemon_threads = True
def start_http_server(
port: int, addr: str = "", registry: CollectorRegistry = REGISTRY
) -> None:
"""Starts an HTTP server for prometheus metrics as a daemon thread"""
CustomMetricsHandler = MetricsHandler.factory(registry)
httpd = _ThreadingSimpleServer((addr, port), CustomMetricsHandler)
t = threading.Thread(target=httpd.serve_forever)
t.daemon = True
t.start()
class MetricsResource(Resource):
"""
Twisted ``Resource`` that serves prometheus metrics.
"""
isLeaf = True
def __init__(self, registry: CollectorRegistry = REGISTRY):
self.registry = registry
def render_GET(self, request: Request) -> bytes:
request.setHeader(b"Content-Type", CONTENT_TYPE_LATEST.encode("ascii"))
response = generate_latest(self.registry)
request.setHeader(b"Content-Length", str(len(response)))
return response

38
synapse/metrics/_twisted_exposition.py Normal file
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@ -0,0 +1,38 @@
# Copyright 2015-2019 Prometheus Python Client Developers
# Copyright 2019 Matrix.org Foundation C.I.C.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from prometheus_client import REGISTRY, CollectorRegistry, generate_latest
from twisted.web.resource import Resource
from twisted.web.server import Request
CONTENT_TYPE_LATEST = "text/plain; version=0.0.4; charset=utf-8"
class MetricsResource(Resource):
"""
Twisted ``Resource`` that serves prometheus metrics.
"""
isLeaf = True
def __init__(self, registry: CollectorRegistry = REGISTRY):
self.registry = registry
def render_GET(self, request: Request) -> bytes:
request.setHeader(b"Content-Type", CONTENT_TYPE_LATEST.encode("ascii"))
response = generate_latest(self.registry)
request.setHeader(b"Content-Length", str(len(response)))
return response

7
tests/storage/test_event_metrics.py
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@ -11,8 +11,9 @@
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from prometheus_client import generate_latest
from synapse.metrics import REGISTRY, generate_latest
from synapse.metrics import REGISTRY
from synapse.types import UserID, create_requester
from tests.unittest import HomeserverTestCase
@ -53,8 +54,8 @@ class ExtremStatisticsTestCase(HomeserverTestCase):
items = list(
filter(
lambda x: b"synapse_forward_extremities_" in x,
generate_latest(REGISTRY, emit_help=False).split(b"\n"),
lambda x: b"synapse_forward_extremities_" in x and b"# HELP" not in x,
generate_latest(REGISTRY).split(b"\n"),
)
)