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Tag trace with instance name (#13761)

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We tag the Synapse instance name so that it's an easy jumping off point into the logs. Can also be used to filter for an instance that is under load.

As suggested by @clokep and @reivilibre in,

 - https://github.com/matrix-org/synapse/pull/13729#discussion_r964719258
 - https://github.com/matrix-org/synapse/pull/13729#discussion_r964733578
This commit is contained in:
Eric Eastwood 2022-09-09 11:31:37 -05:00 committed by GitHub
parent f694bb71b7
commit a911ffb42c
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3 changed files with 12 additions and 2 deletions
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1
changelog.d/13761.misc Normal file
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@ -0,0 +1 @@
Tag traces with the instance name to be able to easily jump into the right logs and filter traces by instance.

7
synapse/api/auth.py
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@ -32,6 +32,7 @@ from synapse.appservice import ApplicationService
from synapse.http import get_request_user_agent
from synapse.http.site import SynapseRequest
from synapse.logging.opentracing import (
SynapseTags,
active_span,
force_tracing,
start_active_span,
@ -161,6 +162,12 @@ class Auth:
parent_span.set_tag(
"authenticated_entity", requester.authenticated_entity
)
# We tag the Synapse instance name so that it's an easy jumping
# off point into the logs. Can also be used to filter for an
# instance that is under load.
parent_span.set_tag(
SynapseTags.INSTANCE_NAME, self.hs.get_instance_name()
)
parent_span.set_tag("user_id", requester.user.to_string())
if requester.device_id is not None:
parent_span.set_tag("device_id", requester.device_id)

6
synapse/logging/opentracing.py
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@ -298,6 +298,8 @@ class SynapseTags:
# Whether the sync response has new data to be returned to the client.
SYNC_RESULT = "sync.new_data"
INSTANCE_NAME = "instance_name"
# incoming HTTP request ID (as written in the logs)
REQUEST_ID = "request_id"
@ -1043,11 +1045,11 @@ def trace_servlet(
# with JsonResource).
scope.span.set_operation_name(request.request_metrics.name)
# set the tags *after* the servlet completes, in case it decided to
# prioritise the span (tags will get dropped on unprioritised spans)
request_tags[
SynapseTags.REQUEST_TAG
] = request.request_metrics.start_context.tag
# set the tags *after* the servlet completes, in case it decided to
# prioritise the span (tags will get dropped on unprioritised spans)
for k, v in request_tags.items():
scope.span.set_tag(k, v)