RenderLog.durationMs is the wall-clock time the render took, in milliseconds, taken from the render engine's measured durationMs. It is the primary latency signal for the service: operators chart it by source or tenantId to spot slow document types or regressions. On a failed render the value is recorded as 0 together with success: false, so non-zero durations correspond to renders that actually produced bytes.
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RenderLog.durationMs
How long a render took, in milliseconds — zero on failure.