Modern　network　measurement　employs　several　measurement　points　in　the　substrate　network.　These　points　perform　measurement　tasks　to　measure　traffic　and　report　real-time　events　to　monitoring　servers　in　the　control　plane.　These　servers　convert　events　to　flow　statistics　and　report　them　to　network　management　applications,　which　require　both　low　latency　(i.e.,　collecting　events　within　a　limited　time　deadline)　and　high　reliability　(i.e.,　bounding　the　probability　of　event　loss).　However,　existing　solutions　fail　to　satisfy　the　two　requirements　because　they　ignore　the　transmission　latency　and　reliability　when　collecting　events　from　measurement　points　to　monitoring　servers.　In　this　paper,　we　propose　Terra,　a　framework　that　aims　to　offer　low-latency　and　reliable　event　collection.　Terra　provides　a　near-optimal　heuristic　that　guides　each　measurement　point　to　select　monitoring　servers　to　receive　its　events　and　corresponding　network　paths　for　transferring　events　with　timeliness　and　reliability　guarantee.　We　have　implemented　Terra　on　a　64　×　100　Gbps　Tofino-based　switch.　We　conduct　testbed　experiments　to　demonstrate　the　effectiveness　of　Terra　in　practice.　The　results　indicate　that　Terra　offers　low-latency　and　reliable　event　collection　while　preserving　high　application-level　accuracy.　©　2024　Elsevier　Ltd