Drop empty fluentbit filter events

bob-common/mkosi.extra/etc/fluent-bit/delay.lua

@@ -2,7 +2,7 @@
 -- Lua script stays in memory for the lifetime of the Fluent Bit process,
 -- so all local variables persist across filter calls.
 
-local DELAY_SEC = 300 -- Delay (in seconds) before flushing logs
+local DELAY_SEC = 30 -- Delay (in seconds) before flushing logs
 local buckets = {} -- Table to bucket logs by their timestamp (seconds)
 local earliest_sec = nil -- Tracks the earliest second we have in our buckets table
 local last_processed_second = nil -- Tracks which second we last ran the flush logic on
@@ -26,7 +26,7 @@ function log_delay(tag, ts_table, record)
     -- 2) Check if we've already processed this second
     if last_processed_second == now_floor then
         -- Skip the flush; Return no output
-        return 2, ts_table, {}
+        return -1, ts_table, {}
     end
 
     -- 3) Otherwise, do the flush logic once for this second
@@ -49,7 +49,7 @@ function log_delay(tag, ts_table, record)
 
     -- 4) Return any flushed logs
     if #to_emit == 0 then
-        return 2, ts_table, {}
+        return -1, ts_table, {}
     else
         local new_ts = { sec = now_sec, nsec = 0 }
         return 1, new_ts, to_emit