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Add OpenTracing for database activity. (#10113)

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This adds quite a lot of OpenTracing decoration for database activity. Specifically it adds tracing at four different levels:

 * emit a span for each "interaction" - ie, the top level database function that we tend to call "transaction", but isn't really, because it can end up as multiple transactions.
 * emit a span while we hold a database connection open
 * emit a span for each database transaction - actual actual transaction.
 * emit a span for each database query.

I'm aware this might be quite a lot of overhead, but even just running it on a local Synapse it looks really interesting, and I hope the overhead can be offset just by turning down the sampling frequency and finding other ways of tracing requests of interest (eg, the `force_tracing_for_users` setting).
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Richard van der Hoff 2021-06-03 16:31:56 +01:00 • committed by GitHub
parent 1d143074c5
commit 9eea4646be
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3 changed files with 57 additions and 30 deletions
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6
synapse/logging/opentracing.py
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@ -271,6 +271,12 @@ class SynapseTags:
# HTTP request tag (used to distinguish full vs incremental syncs, etc)
REQUEST_TAG = "request_tag"
# Text description of a database transaction
DB_TXN_DESC = "db.txn_desc"
# Uniqueish ID of a database transaction
DB_TXN_ID = "db.txn_id"
# Block everything by default
# A regex which matches the server_names to expose traces for.