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spire-agent: re-attest without restarting
Pull Request check list
- [ ] Commit conforms to CONTRIBUTING.md?
- [ ] Proper tests/regressions included?
- [ ] Documentation updated?
Affected functionality spire-agent behaviour in case of eviction or expired agent SVID
Description of change When an agent is evicted it can re-attest to reconnect to spire-server but it currently needs to restart to do that. To avoid unavailability periods, which can lead to noticeable latency in workloads, reattest in process.