Fix mdadm collector for resync=PENDING.

Add fix for mdadm devices in state `resync=PENDING`.
* Update test and fixture.

collector/fixtures/e2e-output.txt

@@ -500,6 +500,7 @@ node_load5 0.37
 # TYPE node_md_blocks gauge
 node_md_blocks{device="md0"} 248896
 node_md_blocks{device="md10"} 3.14159265e+08
+node_md_blocks{device="md11"} 4.190208e+06
 node_md_blocks{device="md127"} 3.12319552e+08
 node_md_blocks{device="md3"} 5.853468288e+09
 node_md_blocks{device="md4"} 4.883648e+06
@@ -511,6 +512,7 @@ node_md_blocks{device="md9"} 523968
 # TYPE node_md_blocks_synced gauge
 node_md_blocks_synced{device="md0"} 248896
 node_md_blocks_synced{device="md10"} 3.14159265e+08
+node_md_blocks_synced{device="md11"} 4.190208e+06
 node_md_blocks_synced{device="md127"} 3.12319552e+08
 node_md_blocks_synced{device="md3"} 5.853468288e+09
 node_md_blocks_synced{device="md4"} 4.883648e+06
@@ -522,6 +524,7 @@ node_md_blocks_synced{device="md9"} 523968
 # TYPE node_md_disks gauge
 node_md_disks{device="md0"} 2
 node_md_disks{device="md10"} 2
+node_md_disks{device="md11"} 2
 node_md_disks{device="md127"} 2
 node_md_disks{device="md3"} 8
 node_md_disks{device="md4"} 2
@@ -533,6 +536,7 @@ node_md_disks{device="md9"} 4
 # TYPE node_md_disks_active gauge
 node_md_disks_active{device="md0"} 2
 node_md_disks_active{device="md10"} 2
+node_md_disks_active{device="md11"} 2
 node_md_disks_active{device="md127"} 2
 node_md_disks_active{device="md3"} 8
 node_md_disks_active{device="md4"} 2
@@ -544,6 +548,7 @@ node_md_disks_active{device="md9"} 4
 # TYPE node_md_is_active gauge
 node_md_is_active{device="md0"} 1
 node_md_is_active{device="md10"} 1
+node_md_is_active{device="md11"} 1
 node_md_is_active{device="md127"} 1
 node_md_is_active{device="md3"} 1
 node_md_is_active{device="md4"} 0

collector/fixtures/proc/mdstat

@@ -30,4 +30,8 @@ md9 : active raid1 sdc2[2] sdd2[3] sdb2[1] sda2[0]
 md10 : active raid0 sda1[0] sdb1[1]
       314159265 blocks 64k chunks
 
+md11 : active (auto-read-only) raid1 sdb2[0] sdc2[1]
+      4190208 blocks super 1.2 [2/2] [UU]
+        resync=PENDING
+
 unused devices: <none>

collector/mdadm_linux.go

@@ -190,7 +190,7 @@ func parseMdstat(mdStatusFilePath string) ([]mdStatus, error) {
 
 		// If device is syncing at the moment, get the number of currently synced bytes,
 		// otherwise that number equals the size of the device.
-		if strings.Contains(lines[j], "recovery") || strings.Contains(lines[j], "resync") && !strings.Contains(lines[j], "resync=DELAYED") {
+		if strings.Contains(lines[j], "recovery") || strings.Contains(lines[j], "resync") && !strings.Contains(lines[j], "resync=DELAYED") && !strings.Contains(lines[j], "resync=PENDING") {
 			syncedBlocks, err = evalBuildline(lines[j])
 			if err != nil {
 				return mdStates, fmt.Errorf("error parsing mdstat: %s", err)

collector/mdadm_linux_test.go

@@ -34,6 +34,7 @@ func TestMdadm(t *testing.T) {
 		"md7":   {"md7", true, 3, 4, 7813735424, 7813735424},
 		"md9":   {"md9", true, 4, 4, 523968, 523968},
 		"md10":  {"md10", true, 2, 2, 314159265, 314159265},
+		"md11":  {"md11", true, 2, 2, 4190208, 4190208},
 	}
 
 	for _, md := range mdStates {