Discard stale information from DiskIO and NetworkIO meters

This ensures the initial read of the data is not misinterpreted as arbitrarily large values.
Also this forces the maximum update interval between two subsequent reads to within 30s.

Fixes #860

1 files changed, 6 insertions, 0 deletions

diff --git a/NetworkIOMeter.c b/NetworkIOMeter.c
index dcba78de..6c429c32 100644
--- a/NetworkIOMeter.c
+++ b/NetworkIOMeter.c
@@ -85,6 +85,12 @@ static void NetworkIOMeter_updateValues(Meter* this) {
       cached_txp_total = data.packetsTransmitted;
    }
 
+   if (passedTimeInMs > 30000) {
+      // Triggers for the first initialization and
+      // when there was a long time we did not collect updates
+      hasData = false;
+   }
+
    this->values[0] = cached_rxb_diff;
    this->values[1] = cached_txb_diff;
    if (cached_rxb_diff + cached_txb_diff > this->total) {