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Sergey Shinder4d ago • 2 min read
Our log shipper moved to the host network and could no longer find the cluster
In July, during an incident on our order service, I searched for its logs from the previous three...
#sergeyshinder#kubernetes#dns#logging
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Sergey Shinder4d ago • 2 min read
One export job switched off the query timeout for strangers
On a Tuesday afternoon in September every service that uses our orders database stopped for twenty.....
#sergeyshinder#sre#postgres#database
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Sergey Shinder4d ago • 2 min read
We recreated our CI role with the same name and lost control of our encryption keys
In June every nightly database export failed with AccessDenied on kms:GenerateDataKey. The role that...
#sergeyshinder#terraform#aws#security
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Sergey Shinder4d ago • 2 min read
A cleanup job that listed every cart key paused Redis for the whole site
Through November our checkout failed in short bursts, about two seconds long, roughly every ten...
#sergeyshinder#sre#redis#performance
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Sergey Shinder4d ago • 2 min read
Our signing certificate expired and took every installer we had ever shipped with it
In March a new depot opened and its PCs could not install our dispatch client. Our setup script...
#sergeyshinder#releaseengineering#windows#security
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Sergey Shinder4d ago • 2 min read
Our deploy form had an unticked box and every deploy rebuilt the search index
In August a customer told us that our catalogue search went strange for most of an hour every time w...
#sergeyshinder#cicd#githubactions#automation
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Sergey ShinderOct 16, 2026 • 2 min read
Terraform said no changes and our Lambda kept running last month's code
In March one of our suppliers changed the date format on their delivery notes, and the Lambda that.....
#sergeyshinder#terraform#aws#serverless
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Sergey ShinderOct 16, 2026 • 2 min read
Kubernetes knew why checkout failed at three in the morning and forgot by four
In May our checkout returned 503 for eleven minutes, starting at ten past three in the morning. By.....
#sergeyshinder#observability#kubernetes#monitoring
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Sergey ShinderOct 16, 2026 • 2 min read
Every supplier file with a space in its name was refused as access denied
In April we sold for four days at last month's prices. Our largest supplier had raised theirs on the...
#sergeyshinder#api#integration#aws
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Sergey Shinder4d ago • 2 min read
Our new API gateway lowercased every header and no partner could place an order
At nine on a Monday in March, every one of our trade partners' systems started getting 400 Bad...
#sergeyshinder#api#integration#aws
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Sergey Shinder4d ago • 2 min read
Our backup dashboard stayed green for five weeks after the job had moved
In September a developer asked for a copy of the orders database from the previous Friday to...
#sergeyshinder#observability#prometheus#backups
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Sergey ShinderOct 16, 2026 • 2 min read
Our build cache was saved once in January and never again
In September I went looking for the reason our order service took seventeen minutes to build. In...
#sergeyshinder#cicd#githubactions#maven
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Sergey ShinderOct 16, 2026 • 2 min read
Our autoscaler stopped scaling the day we added a sidecar without a CPU request
On the first Monday of January, when our trade customers restock after the holidays, the catalogue.....
#sergeyshinder#kubernetes#autoscaling#containers
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Sergey ShinderOct 16, 2026 • 2 min read
Our routing table outgrew kubectl apply and half a release went out
In June we opened a new depot, and release 7.3 of our routing service was meant to start sending it....
#sergeyshinder#releaseengineering#kubernetes#kubectl
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