Fix new metric where we used ms instead of seconds (#7771)

Introduced in #7755, not yet released.

1 files changed, 1 insertions, 0 deletions

diff --git a/changelog.d/7771.misc b/changelog.d/7771.misc
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+Add some metrics for inbound and outbound federation latencies: `synapse_federation_server_pdu_process_time` and `synapse_event_processing_lag_by_event`.