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* remote-write: slow down retries to avoid DDOS Increase the default max retry time from 100ms to 5 seconds. Remote write calls are retried after a recoverable error such as the back-end returning 500. Prometheus waits the minimum time and retries, then doubles the wait on each subsequent retry until the maximum is reached. If some data is still getting through, remote-write will also increase shards, and the default maximum is 200. 200 shards sending every 100ms is 20 calls per second, to a back-end that is already in trouble. 5 seconds was chosen to match the default BatchSendDeadline: if we can afford to wait that long for no response, then we can wait the same time to retry. We will reach 5 seconds after 9 successive failures. Signed-off-by: Bryan Boreham <bjboreham@gmail.com> * Update config doc for max_backoff change Signed-off-by: Bryan Boreham <bjboreham@gmail.com> |
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