Logflare / logflare / cd396ba4b158e3c93737e499a332903434f3d7d0
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test: stabilize syslog truncation properties and scheduler metrics (#3478)

The two syslog property tests asserted byte_size(syslog_msg) <= max_bytes
for all max_bytes in 1..100_000, but SyslogAdaptor.Syslog always emits the
full RFC5424 headers — when max_message_bytes falls below the headers
length (~74 bytes for a factory log event), the frame is headers + empty
body, which exceeds max_bytes. This intermittently failed on main when
StreamData generated a small max_bytes (e.g. seed 769458 → max_bytes=6).

Measure the headers length per log event and assert against
max(max_bytes, headers_floor). For the ciphertext property, skip the
decryption assertions when max_bytes leaves no room for an encrypted
payload (the frame is just headers in that case).

Also document the contract on Syslog.format/2 so the headers-floor
behavior is visible to callers without reading the implementation.

The "scheduler metrics" test in telemetry_test.exs was flaking on slow
CI runners: it called Schedulers.async_dispatch_stats/1 (which spawns a
supervised task) and then assert_receive with the default 100ms timeout.
Spawn + 10ms sample + dispatch can exceed 100ms under load. Switch to
the synchronous Schedulers.collect_dispatch_stats/1 — same emission
logic, no race — matching the synchronous-call pattern other tests in
this file already use.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

12479 of 15608 relevant lines covered (79.95%)

5272.77 hits per line

Coverage Regressions

Lines Coverage ∆ File
1
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 -6.67% lib/logflare/system_metrics/schedulers/schedulers.ex
Jobs
ID Job ID Ran Files Coverage
1 cd396ba4b158e3c93737e499a332903434f3d7d0.1 473
79.95
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Source Files on build cd396ba4b158e3c93737e499a332903434f3d7d0