Add prometheus metrics to track federation delays (#8430)

Add a pair of federation metrics to track the delays in sending PDUs to/from 
particular servers.
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Richard van der Hoff 2020-10-01 11:09:12 +01:00 committed by GitHub
parent 7941372ec8
commit c1ef579b63
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8 changed files with 88 additions and 6 deletions

1
changelog.d/8430.feature Normal file
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@ -0,0 +1 @@
Add prometheus metrics to track federation delays.

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@ -629,6 +629,7 @@ acme:
#tls_fingerprints: [{"sha256": "<base64_encoded_sha256_fingerprint>"}]
## Federation ##
# Restrict federation to the following whitelist of domains.
# N.B. we recommend also firewalling your federation listener to limit
@ -662,6 +663,17 @@ federation_ip_range_blacklist:
- 'fe80::/64'
- 'fc00::/7'
# Report prometheus metrics on the age of PDUs being sent to and received from
# the following domains. This can be used to give an idea of "delay" on inbound
# and outbound federation, though be aware that any delay can be due to problems
# at either end or with the intermediate network.
#
# By default, no domains are monitored in this way.
#
#federation_metrics_domains:
# - matrix.org
# - example.com
## Caching ##

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@ -12,7 +12,7 @@
# 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 typing import Any, List
from typing import Any, Iterable
import jsonschema
@ -20,7 +20,9 @@ from synapse.config._base import ConfigError
from synapse.types import JsonDict
def validate_config(json_schema: JsonDict, config: Any, config_path: List[str]) -> None:
def validate_config(
json_schema: JsonDict, config: Any, config_path: Iterable[str]
) -> None:
"""Validates a config setting against a JsonSchema definition
This can be used to validate a section of the config file against a schema

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@ -17,7 +17,8 @@ from typing import Optional
from netaddr import IPSet
from ._base import Config, ConfigError
from synapse.config._base import Config, ConfigError
from synapse.config._util import validate_config
class FederationConfig(Config):
@ -52,8 +53,18 @@ class FederationConfig(Config):
"Invalid range(s) provided in federation_ip_range_blacklist: %s" % e
)
federation_metrics_domains = config.get("federation_metrics_domains") or []
validate_config(
_METRICS_FOR_DOMAINS_SCHEMA,
federation_metrics_domains,
("federation_metrics_domains",),
)
self.federation_metrics_domains = set(federation_metrics_domains)
def generate_config_section(self, config_dir_path, server_name, **kwargs):
return """\
## Federation ##
# Restrict federation to the following whitelist of domains.
# N.B. we recommend also firewalling your federation listener to limit
# inbound federation traffic as early as possible, rather than relying
@ -85,4 +96,18 @@ class FederationConfig(Config):
- '::1/128'
- 'fe80::/64'
- 'fc00::/7'
# Report prometheus metrics on the age of PDUs being sent to and received from
# the following domains. This can be used to give an idea of "delay" on inbound
# and outbound federation, though be aware that any delay can be due to problems
# at either end or with the intermediate network.
#
# By default, no domains are monitored in this way.
#
#federation_metrics_domains:
# - matrix.org
# - example.com
"""
_METRICS_FOR_DOMAINS_SCHEMA = {"type": "array", "items": {"type": "string"}}

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@ -92,5 +92,4 @@ class HomeServerConfig(RootConfig):
TracerConfig,
WorkerConfig,
RedisConfig,
FederationConfig,
]

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@ -471,7 +471,6 @@ class TlsConfig(Config):
# or by checking matrix.org/federationtester/api/report?server_name=$host
#
#tls_fingerprints: [{"sha256": "<base64_encoded_sha256_fingerprint>"}]
"""
# Lowercase the string representation of boolean values
% {

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@ -28,7 +28,7 @@ from typing import (
Union,
)
from prometheus_client import Counter, Histogram
from prometheus_client import Counter, Gauge, Histogram
from twisted.internet import defer
from twisted.internet.abstract import isIPAddress
@ -88,6 +88,13 @@ pdu_process_time = Histogram(
)
last_pdu_age_metric = Gauge(
"synapse_federation_last_received_pdu_age",
"The age (in seconds) of the last PDU successfully received from the given domain",
labelnames=("server_name",),
)
class FederationServer(FederationBase):
def __init__(self, hs):
super().__init__(hs)
@ -118,6 +125,10 @@ class FederationServer(FederationBase):
hs, "state_ids_resp", timeout_ms=30000
)
self._federation_metrics_domains = (
hs.get_config().federation.federation_metrics_domains
)
async def on_backfill_request(
self, origin: str, room_id: str, versions: List[str], limit: int
) -> Tuple[int, Dict[str, Any]]:
@ -262,7 +273,11 @@ class FederationServer(FederationBase):
pdus_by_room = {} # type: Dict[str, List[EventBase]]
newest_pdu_ts = 0
for p in transaction.pdus: # type: ignore
# FIXME (richardv): I don't think this works:
# https://github.com/matrix-org/synapse/issues/8429
if "unsigned" in p:
unsigned = p["unsigned"]
if "age" in unsigned:
@ -300,6 +315,9 @@ class FederationServer(FederationBase):
event = event_from_pdu_json(p, room_version)
pdus_by_room.setdefault(room_id, []).append(event)
if event.origin_server_ts > newest_pdu_ts:
newest_pdu_ts = event.origin_server_ts
pdu_results = {}
# we can process different rooms in parallel (which is useful if they
@ -340,6 +358,10 @@ class FederationServer(FederationBase):
process_pdus_for_room, pdus_by_room.keys(), TRANSACTION_CONCURRENCY_LIMIT
)
if newest_pdu_ts and origin in self._federation_metrics_domains:
newest_pdu_age = self._clock.time_msec() - newest_pdu_ts
last_pdu_age_metric.labels(server_name=origin).set(newest_pdu_age / 1000)
return pdu_results
async def _handle_edus_in_txn(self, origin: str, transaction: Transaction):

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@ -15,6 +15,8 @@
import logging
from typing import TYPE_CHECKING, List
from prometheus_client import Gauge
from synapse.api.errors import HttpResponseException
from synapse.events import EventBase
from synapse.federation.persistence import TransactionActions
@ -34,6 +36,12 @@ if TYPE_CHECKING:
logger = logging.getLogger(__name__)
last_pdu_age_metric = Gauge(
"synapse_federation_last_sent_pdu_age",
"The age (in seconds) of the last PDU successfully sent to the given domain",
labelnames=("server_name",),
)
class TransactionManager:
"""Helper class which handles building and sending transactions
@ -48,6 +56,10 @@ class TransactionManager:
self._transaction_actions = TransactionActions(self._store)
self._transport_layer = hs.get_federation_transport_client()
self._federation_metrics_domains = (
hs.get_config().federation.federation_metrics_domains
)
# HACK to get unique tx id
self._next_txn_id = int(self.clock.time_msec())
@ -119,6 +131,9 @@ class TransactionManager:
# FIXME (erikj): This is a bit of a hack to make the Pdu age
# keys work
# FIXME (richardv): I also believe it no longer works. We (now?) store
# "age_ts" in "unsigned" rather than at the top level. See
# https://github.com/matrix-org/synapse/issues/8429.
def json_data_cb():
data = transaction.get_dict()
now = int(self.clock.time_msec())
@ -167,5 +182,12 @@ class TransactionManager:
)
success = False
if success and pdus and destination in self._federation_metrics_domains:
last_pdu = pdus[-1]
last_pdu_age = self.clock.time_msec() - last_pdu.origin_server_ts
last_pdu_age_metric.labels(server_name=destination).set(
last_pdu_age / 1000
)
set_tag(tags.ERROR, not success)
return success